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The 9/11 advance-knowledge debate is the ensemble of discussions about whether institutions or individuals other than the perpetrators had foreknowledge of the September 11 attacks and should have taken action to try to prevent them.

Some of the issues under debate include whether the Bush administration or military knew about the threat of planes being used as missiles; how much the intelligence agencies knew about al-Qaeda activities inside the United States; whether the put options placed on United Airlines and American Airlines and other trades indicate foreknowledge, and why the identities of the traders have never been made public.

Also under question is whether the warnings received from foreign countries were specific enough to have warranted action; whether intelligence information gathered about imminent al Qaeda attacks was specific enough to have warranted action; the extent to which the alleged hijackers were under surveillance prior to the attacks; and whether agents of the Mossad or the Pakistani Inter-Services Intelligence were aware that the attacks were going to take place.

Using planes as missiles

Immediately following the attacks, President George W. Bush stated that "nobody in our government at least, and I don't the think the prior government, could envisage flying air planes into buildings" and National Security Advisor Condoleezza Rice claimed no-one "could have predicted that they would try to use an airplane as a missile". An Air Force general called the attack "something we had never seen before, something we had never even thought of." Soon after the attacks, FBI Director Robert Mueller announced "there were no warning signs that I'm aware of that would indicate this type of operation in the country."

Some mainstream media reports have conflicted with these statements, claiming that the FBI, CIA and Executive Branch knew of the threat of planes being used as missiles as early as 1995, following the foiling of the Bojinka Plot. The Chicago Sun-Times reported that:

The FBI had advance indications of plans to hijack U.S. airliners and use them as weapons, but neither acted on them nor distributed the intelligence to local police agencies. From the moment of the September 11 attacks, high-ranking federal officials insisted that the terrorists’ method of operation surprised them. Many stick to that story. Actually, elements of the hijacking plan were known to the FBI as early as 1995 and, if coupled with current information, might have uncovered the plot.”

The book The Terror Timeline includes numerous articles that are often cited to suggest that the method of flying planes into buildings was known by U.S. officials:

• In 1994, there were three examples of failed attempts to deliberately crash planes into buildings, including one where a lone pilot crashed a small plane into the lawn of the White House.
• The Bojinka Plot was a foiled large-scale al Qaeda terrorist attack to blow up eleven airliners and their passengers as they flew from Asia to America, due to take place in January 1995.
• The 2000 edition of the FAA’s annual report on Criminal Acts Against Aviation said that although Osama bin Laden ‘is not known to have attacked civil aviation, he has both the motivation and the wherewithal to do so,’ adding, ‘Bin Laden’s anti-Western and anti-American attitudes make him and his followers a significant threat to civil aviation, particularly to U.S. civil aviation.’”
• In April 2001, NORAD ran a war game in which the Pentagon was to become incapacitated; a NORAD planner proposed the simulated crash of a hijacked foreign commercial airliner into the Pentagon but the Joints Chiefs of Staff rejected that scenario as "too unrealistic"
• In July 2001 at the G8 summit in Genoa, anti-aircraft missile batteries were installed following a report that terrorists would try to crash a plane to kill George Bush and other world leaders.
• On the morning of September 11, 2001, the National Reconnaissance Office, who are responsible for operating U.S. reconnaissance satellites, had scheduled an exercise simulating the crashing of an aircraft into their building, four miles (6 km) from Washington Dulles International Airport.

A 2004 USA Today article, "NORAD had drills of jets as weapons", describes pre-9/11 NORAD drills that suggest they were prepared for such an attack as happened on 9/11:

"In the two years before the September 11 attacks, the North American Aerospace Defense Command conducted exercises simulating what the White House says was unimaginable at the time: hijacked airliners used as weapons to crash into targets and cause mass casualties. One of the imagined targets was the World Trade Center. In another exercise, jets performed a mock shootdown over the Atlantic Ocean of a jet supposedly laden with chemical poisons headed toward a target in the United States. In a third scenario, the target was the Pentagon — but that drill was not run after Defense officials said it was unrealistic."

That NORAD was aware of the threat of terrorists hijacking commercial airliners within the United States, and using them as guided missiles, was flatly denied by the 9/11 Commission, which asserted several times in their report that "The threat of terrorists hijacking commercial airliners within the United States -- and using them as guided missiles -- was not recognized by NORAD before 9/11."

The Joint Inquiry of 2002 confirmed that the Intelligence Community had received at least twelve reports over a seven-year period suggesting that terrorists might use planes as weapons. After briefly discussing each of them, it says that "The CIA disseminated several of these reports to the FBI and to agencies responsible for preventive actions. They included the FAA... Despite these reports, the Intelligence Community did not produce any assessments of the likelihood that terrorists would use planes as weapons, and U.S. policymakers apparently remained unaware of this kind of potential threat." Former National Security Advisor Sandy Berger testified to the Joint Inquiry:

"We heard of the idea of planes as weapons, but I don't recall being presented with any specific threat information about an attack of this nature, or highlighting this threat, or indicating it was more likely than any other"

The concept of airliners as weapons had been broadly popularized in the 1994 Tom Clancy novel Debt of Honor and the 1996 Kurt Russell movie Executive Decision, with stories in both cases having 747s used as weapons targeted against Washington, D.C.

Insider trading

The Times reported on September 18 that investigations were under way into the unusually large numbers of shares in insurance companies and airlines sold off before the attack, in the UK, Italy, Germany, Japan, Switzerland, France and the US. News accounts in the weeks that followed reported a notable pattern of trading in the options of United and American Airlines as well as Morgan Stanley and other market activity. An article published in The Journal of Business in 2006 provides statistical evidence of unusual put option market activity days before 9/11:

Examination of the option trading leading up to September 11 reveals that there was an unusually high level of put buying. This finding is consistent with informed investors having traded options before the attacks.

In a statement to the 9/11 Commission in 2003, Mindy Kleinberg, of the 9/11 Family Steering Committee, said:

Never before on the Chicago Exchange were such large amounts of United and American Airlines options traded. These investors netted a profit of at least $5 million after the September 11 attacks. Interestingly, the names of the investors remain undisclosed and the $5 million remains unclaimed in the Chicago Exchange account.

Regarding these trades, the 9/11 Commission found no malfeasance:

A single U.S.-based institutional investor with no conceivable ties to al Qaeda purchased 95% of the UAL puts on September 6 as part of a trading strategy that also included buying 115,000 shares of American on September 10... much of the seemingly suspicious trading in American on September 10 was traced to a specific U.S.-based options trading newsletter, faxed to its subscribers on Sunday, September 9, that recommended these trades.

WTC hard drive restoration operation

In December 2001 and early 2002, there was extensive media coverage of the efforts by the German data retrieval company Convar to reconstruct, using laser scanning technology, data from damaged hard drives recovered from the WTC as part of the investigation into a surge in financial transactions just before the two hijacked planes crashed into New York's World Trade Center. The company's CEO, Peter Henschel, noting that the investigation was being conducted for a number of U.S. based clients cooperating with the FBI, said that there was suspicion that criminals had used inside knowledge about the attacks to make and authorize financial transactions during the chaos. According to Convar's data retrieval expert Richard Wagner, criminal transactions in excess of 100 million dollars could have been made in the hope that their trail would have disappeared as a result of the destruction of the WTC mainframe computers. As reported by the Heute Journal, a news programme by the German ZDF TV channel, by March 2002 Convar had been able to restore several hundred hard drives from the WTC.

However, the 9/11 Commission, in a memorandum entitled "FBI Briefing on Trading" dated October 18, 2003, said that when asked about the media coverage of the hard drive restoration operation, the "assembled agents expressed no knowledge of the reported hard-drive recovery effort", further noting that one New York agent argued that it was "extremely unlikely that any hard-drives survived to the extent that they data be recovered."

Later research

The papers of several finance researchers also suggest that some profited from foreknowledge of 9/11. In 2006, Allen Poteshman, a professor of Finance from the University of Illinois, published an analysis of the airline stock option trades preceding the attacks. This peer-reviewed study, published by the University of Chicago Press, came to the conclusion that an indicator of long put volume was "unusually high which is consistent with informed investors having traded in the option market in advance of the attacks". In January 2010, a team of Swiss financial experts published evidence for at least thirteen informed trades in which the investors had apparent foreknowledge of the attacks. Finally, in April 2010, an international team of experts showed that there was a significant abnormal increase in trading volume in the option market just before the 9/11 attacks in contrast to the absence of abnormal trading volume over periods long before the attacks, concluding that their findings were "consistent with insiders anticipating the 9-11 attacks".

Intelligence warnings

The 9/11 Commission Report states that "the 9/11 attacks were a shock, but they should not have come as a surprise. Islamic extremists had given plenty of warnings that they meant to kill Americans indiscriminately and in large numbers." The Report continued:

"During the spring and summer of 2001, U.S. intelligence agencies received a stream of warnings about an attack al Qaeda planned, as one report puts it "something very, very, very big." Director of Central Intelligence George Tenet told us "the system was blinking red.""

The US administration, CIA and FBI received multiple prior warnings from foreign governments and intelligence services, including France, Germany, the UK, Israel, Jordan, Afghanistan, Egypt, Morocco and Russia. The warnings varied in their level of detail, but all stated that they believed an Al Qaeda attack inside the United States was imminent. British Member of Parliament Michael Meacher cites these warnings, suggesting that some of them must have been deliberately ignored. Some of these warnings include the following:

• March 2001 - Italian intelligence warns of an al Qaeda plot in the United States involving a massive strike involving aircraft, based on their wiretap of al Qaeda cell in Milan.
• July 2001 - Jordanian intelligence told US officials that al-Qaeda was planning an attack on American soil, and Egyptian intelligence warned the CIA that 20 al Qaeda Jihadists were in the United States, and that four of them were receiving flight training.
• August 2001 - The Israeli Mossad gives the CIA a list of 19 terrorists living in the US and say that they appear to be planning to carry out an attack in the near future.
• August 2001 - The United Kingdom is warned three times of an imminent al Qaeda attack in the United States, the third specifying multiple airplane hijackings. According to the Sunday Herald, the report is passed on to President Bush a short time later.
• September 2001 - Egyptian intelligence warns American officials that al Qaeda is in the advanced stages of executing a significant operation against an American target, probably within the US.

In her testimony to the 9/11 Commission, Condoleezza Rice stated that "the threat reporting that we received in the spring and summer of 2001 was not specific as to time nor place nor manner of attack. Almost all the reports focused on al Qaeda activities outside the United States." However, on August 6, 2001, the President's Daily Briefing, entitled Bin Ladin Determined To Strike in US warned that bin Laden was planning to exploit his operatives' access to the U.S. to mount a terrorist strike:

FBI information... indicates patterns of suspicious activity in this country, consistent with preparations for hijackings or other types of attack.

Able Danger

A classified military intelligence program known as "Able Danger" was created in October 1999 specifically targeting al Qaeda. Lt. Col. Anthony Shaffer and Congressman Curt Weldon (R-PA) charged before the Senate Judiciary Committee that Able Danger had identified Mohamed Atta, and three of the other hijackers, prior to 9/11.

The existence of Able Danger, and its purported early identification of the 9/11 terrorists, was first disclosed publicly on June 19, 2005. On June 27, 2005, Weldon stated to the House:

Mr. Speaker, I rise because information has come to my attention over the past several months that is very disturbing. I have learned that, in fact, one of our Federal agencies had, in fact, identified the major New York cell of Mohamed Atta prior to 9/11; and I have learned, Mr. Speaker, that in September 2000, that Federal agency actually was prepared to bring the FBI in and prepared to work with the FBI to take down the cell that Mohamed Atta was involved in in New York City, along with two of the other terrorists. I have also learned, Mr. Speaker, that when that recommendation was discussed within that Federal agency, the lawyers in the administration at that time said, you cannot pursue contact with the FBI against that cell. Mohamed Atta is in the U.S. on a green card, and we are fearful of the fallout from the Waco incident. So we did not allow that Federal agency to proceed.

There is no mention of Able Danger in the 9/11 Commission Report. Two 9/11 Commission members, Timothy J. Roemer and John F. Lehman, both claimed not to have received any information on Able Danger. Weldon alleged that intelligence concerning Able Danger was provided to the 9/11 Commission but was ignored.

Following coverage in the national media of Weldon's claims in August 2005, Thomas Kean and Lee H. Hamilton, former Chair and Vice Chair of the 9/11 Commission, issued a statement in which they stated the Commission had been aware of the Able Danger program, and requested and obtained information about it from the Department of Defense (DoD), but none of the information provided had indicated the program had identified Atta or other 9/11 hijackers.

Curt Weldon issued a response to this statement clarifying the mission of Able Danger, expressing concern over the statements made by various members of the 9/11 Commission, and promising to push forward until it is understood why the DoD was unable to pass the information uncovered by Able Danger to the FBI, and why the 9/11 Commission failed to follow up on the information they were given on Able Danger.

Blocked al-Qaeda investigations

Numerous whistleblowers and officials have surfaced, claiming that there was a deliberate effort, from high-ranking officials, to prevent investigations into Al Qaeda.

In 2002, FBI agent Coleen Rowley wrote to FBI director Robert Mueller describing her experience working with Minneapolis FBI agents tracking suspected terrorist Zacarias Moussaoui prior to the attacks. She describes how FBI HQ personnel in Washington, D.C. had mishandled and failed to take action on information provided by the Minneapolis Field Office, and had failed to issue a warrant to search Moussaui's computer despite having probable cause. Rowley goes on to describe her superior, Agent Marion "Spike" Bowman, as having “consistently, almost deliberately thwarted the Minneapolis FBI agents' efforts” to obtain the search warrant. Senator Chuck Grassley later wrote that “If the application for the FISA warrant had gone forward, agents would have found information in Moussaoui's belongings that linked him ... to a major financier of the hijacking plot". Rowley was credited as a whistleblower and jointly awarded the TIME Magazine "Person of the Year" for 2002. Her testimony to the 9/11 Commission was omitted from their final report.

FBI agent and Al-Qaeda expert John P. O'Neill warned of an Al-Qaeda threat to the United States in 2000. He retired from his position in mid 2001, citing repeated blocking of his investigations of Al Qaeda by FBI officials. After his retirement from the FBI, the World Trade Center hired him as its chief of security. He started work on August 23, 2001; 9/11 rescue workers found his body in a staircase inside the south tower rubble.

Shortly after the attacks, David Schippers, the chief prosecutor for the impeachment of Bill Clinton, stated that the government had been warned in 1995 about a future attack on a government building and that later he was contacted by three FBI agents who mentioned uncovering a possible terrorist attack planned for lower Manhattan. According to Schippers, as the agents informed their superiors, they were briefed not to pursue the issue and were threatened with prosecution. Schippers declared, "Five weeks before the September 11 tragedy, I did my best to get a hold of Attorney General John Ashcroft with my concerns." According to Schippers, Ashcroft responded that the Justice Department does not start investigations at the top. Author William Norman Grigg agrees with Schippers in his article "Did We Know What Was Coming?" According to the article, three unnamed veteran federal law enforcement agents confirmed "the information provided to Schippers was widely known within the Bureau before September 11."

According to Senator Bob Graham, who was chairman of the Senate Intelligence Committee from June 2001 through the buildup to the Iraq war, "Two of the September 11, 2001, hijackers had a support network in the United States that included agents of the Saudi government, and the Bush administration and FBI blocked a congressional investigation into that relationship," as reported by the Miami Herald. And in Graham's book, Intelligence Matters, he makes clear that some details of that financial support from Saudi Arabia were in the 27 pages of the congressional inquiry's final report that were blocked from release by the administration, despite the pleas of leaders of both parties on the House and Senate intelligence committees." In March 2012 as part of a lawsuit by 9/11 victims families Graham and another former U.S. Senator Bob Kerry said in affidavit's that they were certain there were direct links between the Saudi government and the attacks.

There have also been allegations that the hijackers' preparations may have been given assistance by U.S. intelligence. According to CBS news, "two of the Sept. 11 hijackers who lived in San Diego in 2000 rented a room from a man who reportedly worked as an undercover FBI informant... the FBI informant prayed with them and even helped one open a bank account." Doubts have been raised about the speed with which the hijackers were identified, leading to suggestions that the FBI already had the names of the hijackers in advance. In his book Against All Enemies, Richard Clarke said that at 9:59 am on September 11, which is the time when WTC2 collapsed and 8 minutes before NORAD even knew Flight 93 had been hijacked, the FBI already had a list of the 19 alleged hijackers. A former high-level intelligence official said that "Whatever trail was left was left deliberately—for the F.B.I. to chase."

Foreign government foreknowledge

It has been suggested that some foreign governments and intelligence agencies may have had some foreknowledge of the attacks. In particular, the possible foreknowledge of the Israeli Mossad, and possible financial ties to Pakistan and Saudi Arabia, have raised doubts about the 9/11 Commission Report conclusion that no one outside the terrorist organization al Qaeda was involved or had foreknowledge of the attacks. There are also questions about how much was known by other governments and intelligence agencies in countries such as France, the UK, Germany, Italy, Morocco, Jordan and Egypt, which all warned the United States of an imminent attack.

Iran

Sibel Edmonds, an FBI translator, stated that the FBI received information in April 2001, from a reliable Iranian intelligence asset, that Osama Bin Laden was planning attacks on 4-5 cities with planes, and that some of the plotters were already in the country and the attacks would happen in a few months.

In 2004 the 9/11 commission "found no evidence that Iran or Hezbollah was aware of the planning for what later became the 9/11 attack." Just before their report was published the committee received evidence which caused to add to the report that the topic required further investigation.

On December 22, 2010 a United States Federal Judge signed a default judgment holding Iran, the Taliban and al-Qaeda liable following an open court hearing in which the evidence was produced by the plaintiffs' attorneys which they said showed that Iran actively assisted the hijackers. 9/11 commission members and witnesses who claimed they were Iranian defectors and members of Ministry of Intelligence and National Security and the Iranian Revolutionary Guards. also testified during the hearing. The suit Havlish, et al. v. bin Laden, et al was brought in 2001 by Fiona Havlish whose husband died in the North Tower. Abolghasem Mesbahi, who claimed he was a former Ministry of Intelligence operative in charge of Iran’s espionage operations in Western Europe testified that he was part of a task force that designed contingency plans for unconventional warfare against the United States code-named Shaitan dar Atash/Satan in Flames which included crashing hijacked passenger airliners into the World Trade Center, the Pentagon, and the White House, and that in the summer of 2001 he received three coded messages telling him to activate the plan. An Iranian government memorandum was presented as evidence that Iran's Supreme Leader Ayatollah Khamenei had pre knowledge of the attacks. Several days after the ruling a spokesperson for Iran's Foreign ministry said charges that Iran “had a hand in planning the attacks and that one of al-Qaeda’s members was present inside the country is baseless” and said "With the repetition of such claims to back its political aims the U.S. is putting the peace and security of the world in jeopardy,”. Investigative historian Gareth Porter wrote that the CIA has dismissed these same claims from some of the same people, the "expert" testimony came people who regularly lied, made up stories and hated Muslims. Porter wrote that Iran instead of harboring Al Queda members Iran had detained them.

In February 2012 President Obama's Director of National Intelligence James Clapper in testified before the Senate Armed Services Committee that "Iran has harbored al-Qaida leaders, facilitators," and that they have been "under house arrest conditions. (Iran's rulers) have had this sort of standoff arrangement with al-Qaida, allowing (al-Qaida) to exist (inside Iran), but not to foment any operations directly from Iran, because they're very sensitive about, 'Hey, we might come after them there as well.'... So there has been this longstanding, as I say, kind of, shotgun marriage, or marriage of convenience."

Israel

It was reported that the Mossad informed the FBI and CIA in August 2001 that as many as 200 terrorists were slipping into the United States and planning "a major assault on the United States." The Israeli intelligence agency allegedly cautioned the FBI that it had picked up indications of a "large-scale target" in the United States and that Americans would be "very vulnerable."

In September, 2001, The New York Times and Israeli newspaper Haaretz reported that four hours after the attack, the FBI arrested five Israelis who had been filming the smoking skyline from the roof of a white van in the parking lot of an apartment building, for "puzzling behavior". They were charged with illegally residing in the United States and working there without permits. The Israelis were said to have been videotaping the disaster with what was interpreted as cries of "joy and mockery". Police found the van and a search revealed $4,700 in cash hidden, along with foreign passports and a boxcutter which aroused suspicions and led to the detention of the occupants. The men were held in detention for more than 2 months, during which time they were subjected to interrogation and lie detector tests, before being deported back to Israel; one of the men (Paul Kurzberg) refused to take the test for 10 weeks, and then failed it.

The five men worked at the company Urban Moving Systems, owned and operated by Dominick Suter. After the men were arrested the FBI searched their offices and questioned Suter, however Suter fled to Israel before he could be questioned further. Eventually, Suter's name appeared on the May 2002 FBI Suspect List, along with the Sept. 11 hijackers and other suspected extremists.

According to a former CIA chief of operations for counterterrorism Vince Cannistraro, there was speculation that Urban Moving Systems may have been a front for an intelligence operation investigating fund-raising networks channeling money to Hamas and Islamic Jihad. On March 15, 2002, The Forward claimed that the FBI had concluded that the van's driver, Paul Kurzberg, and his brother Sivan, were indeed Mossad operatives, who were in America "spying on local Arabs". ABC news cited this report on June 21, 2002, adding that the FBI had concluded that the five Israelis had no foreknowledge of the attacks.

In March, 2001, the US Office of the National Counterintelligence Executive had issued a warning about people identifying themselves as "Israeli art students" attempting to bypass security and gain entry to federal buildings, and even to the private residences of senior federal officials. A French intelligence agency later noted “according to the FBI, Arab terrorists and suspected terror cells lived in Phoenix, Arizona, as well as in Miami and Hollywood, Florida, from December 2000 to April 2001 in direct proximity to the Israeli spy cells”. The report contended that Mossad agents were spying on Mohammed Atta and Marwan al-Shehi, two of leaders of the 9/11 hijack teams. In 2002 several officials dismissed reports of a spy ring and said the allegations were made by a Drug Enforcement Agency who was angry his theories had been dismissed.

The Associated Press reported that "Israeli intelligence services were aware several months before Sept. 11 that bin Laden was planning a large-scale terror attack" and that this information was passed on to Washington. According to Fox News, In August 2001, Israel warned the US that an al-Qaeda attack is imminent. Reportedly, two high-ranking agents from the Mossad came to Washington and warned the FBI and CIA that up to 200 terrorists have slipped into the US and are planning "a major assault on the United States... large scale target."

On February 18, 2009, The New York Times reported that Ali al-Jarrah a Palestinian activist and cousin of 9/11 hijacker Ziad al-Jarrah, was arrested in Lebanon on charges of being a paid Mossad asset over the last two decades. The Times reported that the two cousins were 20 years apart and did not know each other very well.

Iranian President Mahmoud Ahmadinejad said in an August 2010 speech that no Zionists were killed in the attacks since, according to him, "one day earlier they were told not go to their workplace." He also remarked, "What was the story of September 11? During five to six days, and with the aid of the media, they created and prepared public opinion so that everyone considered an attack on Afghanistan and Iraq".

France

On December 5, 2007 French authorities filed preliminary charges against Guillaume Dasquié, a reporter for the daily Le Monde, for publishing state secrets related to the 9/11 hijackings. Dasquié's April 16 article in Le Monde, titled "September 11: the French had long known" claimed the General Directorate of External Security (DGSE), had warned the U.S. of a possible terrorist plot that involved al-Qaeda hijacking planes and crashing them into buildings some eight months before 9/11. The article contained excerpts from a 328-page classified DGSE report on al-Qaeda activities which included maps, analyses, graphics, and satellite photos.

Afghanistan

Moderate elements of the Taliban are reported to have given the USA advance warning of the attacks. The BBC reports that Wakil Ahmed Muttawakil, the Taliban's Foreign Minister, sent the USA an advance warning of the attack following a tip-off he received from Tohir Yo‘ldosh, the leader of the Islamic Movement of Uzbekistan. Like al Qaeda, the Taliban allowed the Islamic Movement of Uzbekistan to place training camps in Afghanistan. Tohir Yo‘ldosh was reported to have been concerned that if al Qaeda was not stopped prior to launching the attacks, the USA would retaliate against all of Afghanistan, which would have a negative effect on his movement's efforts.

Possible warnings given to individuals

There have been claims that some individuals received warnings in advance of the attacks.

• It is often alleged that San Francisco Mayor, Willie Lewis Brown, Jr. canceled his flight plans for September 11 after receiving a warning late on September 10 from what he described as his airport security. In fact it was Brown who first called his security staff at the airport, to check on his flight for the following morning, and they then warned him that he should be cautious about flying. Brown says, "they always alert me when I ought to be careful," and he decided to fly anyway. In September 2006, Willie Brown responded to these escalating conspiracy rumors by calling them an "ongoing myth."
• Odigo Messenger, a company based in Israel, reported that two of their employees who were working in an Odigo office in Herzliya Pituah, a city near Tel Aviv, received a derogatory English electronic instant message, on the day of the attack, non-specifically threatening them that a terrorist attack would happen. They did not mention this to their employer until after they heard reports of a terrorist attack in America on the news, after which they informed the company's management, who traced the IP and contacted the FBI. However, the threatening message did not mention the location of an attack. The notes ended with an anti-Semitic slur. Odigo Vice President of Sales and Marketing Alex Diamandis later said that the message did not identify the United States or the World Trade Center as to be involved in the event, and that "it could easily be coincidence."
• Silverstein Properties who, according to the New York Times, had planned to meet on September 11 on the 88th floor of one of the towers to "discuss what to do in the event of a terrorist attack," but canceled the meeting late on September 10 "because one participant could not attend."
• Susan Lindauer asserts that she and other intelligence colleagues were aware of the attacks in April 2001, and that Richard Carl Fuisz had advised in August 2001 against traveling to New York.
• Parke Godfrey, a professor of computer science at York University in Toronto, Ontario testified in United States v. Susan Lindauer that he had been warned by Lindauer on several occasions of a "massive" attack on southern Manhattan that would involve planes and the possibility of a thermonuclear weapon.

Other related events

On September 6, 2001, a freshman from a class of Pakistani immigrants at New Utrecht High School in Bensonhurst, Brooklyn was overheard by his English teacher, Antoinette DiLorenzo, to say that the two World Trade Center towers "won't be standing there next week." After DiLorenzo reported the incident on September 13, the youth and his older brother were questioned by the FBI and local police. According to police, the youth admitted to making the comment but he and his brother said he had been kidding.

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35. More pre-9/11 US intelligence connections to al-Qaeda exposed and spun Online Journal.Com August 24, 2005 pdf.
36. Claim about 9/11 takes new twist San Francisco Chronicle August 19, 2005.
37. WELDON RESPONDS TO OMISSION OF ABLE DANGER FROM 9/11 REPORT, August 12, 2005. Retrieved 2010-01-12.
38. Coleen Rowley's Memo to FBI Director Robert Mueller, May 21, 2002. Retrieved 2010-01-12.
39. FBI eMails concerning Moussaoui.
40. Kirk, Michael (2002). "The Man Who Knew". Transcript of Frontline program #2103. WGBH Educational Foundation. Retrieved June 11, 2006. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
41. Crogan, Jim (2002). "Another FBI Agent Blows the Whistle". LA Weekly News. LA Weekly, LP. Retrieved June 11, 2006.
42. Grigg, William Norman (2002). "Did We Know What Was Coming?". The New American magazine. American Opinion Publishing Incorporated. Archived from the original on May 28, 2006. Retrieved June 11, 2006.
43. "Graham book: Inquiry into 9/11, Saudi ties blocked". Miami Herald.com. Archived from the original on September 7, 2004.
44. 'Direct line' between 9/11 terrorists, Saudi government, claim ex-US Senators The Expresse Tribune with The International Herald Tribune March 2, 2012
45. "Hijackers Lived With FBI Informant". CBS News. September 9, 2002.
46. JFK and 9/11 - Insights Gained from Studying Both by Dr. Peter Dale Scott, December 20, 2006. Retrieved 2010-01-12.
47. What Went Wrong by Seymour M. Hersh, The New Yorker, October 8, 2001. Retrieved 2010-01-12.
48. April 2, 2004 'I saw papers that show US knew al-Qa'ida would attack cities with aeroplanes' The Independent.
49. FBI & 9/11 - by Sibel Edmonds.
50. ^ May: Al-Qaida's big fat Iranian wedding Clifford May for Scripps Howard News Service
51. Judge: Iran, Taliban, al Qaeda liable for 9/11 CBS News December 22, 2011
52. Federal Judge Rules: Iran Behind 9/11 Attacks – OpEd Eurasia Review December 28, 2011
53. Iran Rejects U.S. Accusations of Sept. 11 Role, Ministry Says Bloomberg
54. Crackpot Anti-Islam Activists, “Serial Fabricators,” and the Tale of Iran and 9/11 by Gareth Porter for Dissident Voice December 31, 2011
55. Officials Told of ‘Major Assault’ Plans LA Times, RICHARD A. SERRANO and JOHN-THOR DAHLBURG|TIMES STAFF WRITERS
56. JAMES RISEN AND DON VAN NATTA JR. (September 14, 2001). "AFTER THE ATTACKS: THE INVESTIGATION; Authorities Have Learned the Identities Of 18 Hijackers, Attorney General Says". New York Times. Retrieved August 5, 2008.
57. 5 Israelis detained for `puzzling behavior' after WTC tragedy By Yossi Melman, Haaretz.com. Retrieved 2010-01-12.
58. "Were Israelis Detained on Sept. 11 Spies?". ABC News. June 21 2001. Retrieved February 25, 2012. {{cite news}}: Check date values in: |date= (help)
59. Times Herald, August 29, 2005.
60. FORWARD : News.
61. Error in Webarchive template: Empty url. June 21, 2002.
62. "Office of the National Counterintelligence Executive: Suspicious Visitors to Federal Facilities (archived at Internet Archive". Archived from the original on January 24, 2007.
63. Fenton, Ben (March 7, 2002). "US arrests 200 young Israelis in spying investigation". The Daily Telegraph. London. Retrieved April 23, 2010.
64. "Salon.com: The Israeli "art student" mystery".
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66. Mintz, John (March 7, 2002). "U.S. officials dismiss report of Israeli spies". Washington Post. Retrieved October 18, 2008. {{cite news}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
67. Lebanese in Shock Over Arrest of an Accused Spy The New York Times February 18, 2009.
68. Robin Pomeroy; Ramin Mostafavi (July 8, 2010). "Iran president: Sept. 11 attacks exaggerated - World news - Mideast/N. Africa - Iran - msnbc.com". MSNBC. Retrieved August 10, 2010.
69. French journalist investigated over intelligence leaks Committee to Protect Journalists December 10, 2007.
70. Kate Clark (September 7, 2002). "Taleban 'warned US of huge attack'". BBC. Retrieved January 16, 2007. An aide to the former Taleban foreign minister, Wakil Ahmad Muttawakil, has revealed that he was sent to warn American diplomats and the United Nations that Osama bin Laden was due to launch a huge attack on American soil. 29, 2008 mirror
71. snopes.com: 9/11 Forewarned Jews.
72. "Willie Brown got low-key early warning about air travel". Matier and Ross. San Francisco Chronicle. September 12, 2001. Retrieved June 11, 2006. {{cite news}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
73. Willie Brown got low-key early warning about air travel at www.sfgate.com.
74. Angelides aides damned if they do or don't at www.sfgate.com
75. Washington Post, "Instant Messages to Israel Warned of WTC attack", 27 September 2001
76. Atlanta Journal-Constitution, 29/09/01
77. "FBI probing 'threatening' message, firm says", Daniel Sieberg, CNN News, September 28, 2001
78. Odigo Clarifies Attack Messages, Newsbytes (The Washington Post), September 28, 2001
79. http://amenusa.org/prior.htm
80. InternetNews Realtime IT News - Odigo: Instant Messages Warned Of Terrorist Attacks at www.atnewyork.com
81. Reinsurance Companies Wait to Sort Out Cost of Damage, New York Times, September 12, 2001. Retrieved 2010-01-12.
82. "Susan Lindauer Speaks in Seattle". YouTube. Retrieved September 17, 2011. And I said, "you think it's that soon?" And he said, "oh, it's just in a couple weeks." And I said, "oh, well, I'll go back to New York and I'll talk to the Iraqi diplomats immediately and see if they've got any word from Baghdad. I'll try one more time." And he said, "Susan, don't go back to New York. Do not go back to New York!" And I said "Richard, you think it's going to be that soon?" and he said "yeah, I don't want you going back to New York at all, until this is over." And I said, "well, I'll go up the day after tomorrow," which was August 4th. And he said "after that, never again until it's done."
83. Collins, Michael (June 20, 2008). "M. Collins: 911 Prediction Revealed at Lindauer Hearing in NYC". "Scoop" Independent News. ProgressNow. Archived from the original on September 17, 2011. Retrieved September 17, 2011.
84. Between The Lines Online: A Chilling Tale | Newsweek National News | Newsweek.com

v t e 9/11 conspiracy theories
Key topics	Advance-knowledge conspiracy theories Opinion polls 9/11 truth movement World Trade Center controlled demolition conspiracy theories
Groups	Architects & Engineers for 9/11 Truth Million Muslim March
Film and TV	911: In Plane Site A Few Days in September Conspiracy Theory with Jesse Ventura Loose Change "Mystery of the Urinal Deuce" Zeitgeist
Books	9/11: The Big Lie American Conspiracies Among the Truthers Debunking 9/11 Myths The CIA and September 11 The New Pearl Harbor The Terror Timeline
Category

• Use mdy dates from August 2010
• Criticism of the official accounts of the September 11 attacks
• September 11 attacks