FBI agents recommended to FBI headquarters, in July 2001, an urgent nationwide review of flight schools regarding terrorism, and mentioned Bin Laden by name.
2 months before 9/11, intelligence services believed that Bin Laden intended to crash airplanes into the G8 Summit in order to kill President Bush and other world leaders. Condoleezza Rice was very focused on this threat to President Bush.
A pre-9/11 National Intelligence Estimate was entitled "Islamic Extremists Learn to Fly", and was apparently about Islamic people taking classes at U.S. flight schools.
A month before 9/11, the CIA sent a message to the Federal Aviation Administration warning of a possible hijacking "or an act of sabotage against a commercial airliner".
"Israeli intelligence officials say that they warned their counterparts in the United States [in August 2001] that large-scale terrorist attacks on highly visible targets on the American mainland were imminent."
The August 6, 2001 Presidential Daily Brief was entitled "Bin Laden Determined to Strike in US".
According to National Public Radio, the former CIA Director had warned congress shortly before 9/11 "that there could be an attack, an imminent attack, on the United States of this nature. So this is not entirely unexpected".
U.S. intelligence officials informed President Bush weeks before the Sept. 11 attacks that Bin Laden's terrorist network might try to hijack American planes, and that information prompted administration officials to issue a private warning to transportation officials and national security agencies.
It was widely known within the FBI shortly before 9/11 that an imminent attack was planned on lower Manhattan.
An employee who worked in the Twin Towers stated "How could they let this happen? They knew this building was a target. Over the past few weeks we'd been evacuated a number of times, which is unusual. I think they had an inkling something was going on"
And a guard who worked in the world trade center stated that "officials had recently taken steps to secure the towers against aerial attacks"
On September 6, 2001, Condoleezza Rice was warned that a terrorist attack inside the United States was imminent
Also on September 6th, author Salman Rushdie is banned by US authorities from taking internal US flights; the FAA told his publisher the reason was that it had “intelligence of something about to happen”
The former FBI translator who the Department of Justice's Inspector General, several senators (free subscription required), and a coalition of prominent conservative and liberal groups have claimed is credible says that the government was provided with information about the planned attacks, including the fact that the attacks would be carried out using airplanes ("I saw papers that show US knew al-Qaeda would attack cities with airplanes"), and some information about date ranges and targets. She says that - after 9/11 - the FBI translators were ordered to "keep quiet" regarding this information.
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