PENTTBOM

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PENTTBOM is the code-name for the FBI investigation into the September 11, 2001 attacks on New York and Washington, D.C, the largest criminal investigation in U.S. history. Its name stands for 'Pentagon/Twin Towers Bombing Investigation'. The investigation was launched on September 11, 2001 and involved 7000 of the 11000 Special Agents of the FBI [1].

Congressional testimony indicates that the FBI was able to identify the 19 hijackers within a matter of days as few suspects made any effort to conceal their names on flight, credit card, and other records.[2]. Additionally three of the hijackers carried an identical handwritten letter (in Arabic) that was found in three separate locations: the first, in a suitcase of hijacker Mohammed Atta which did not make the connection to American Airlines Flight #11 that crashed into the North Tower of the World Trade Center; the second, in a vehicle parked at Dulles International Airport belonging to hijacker Nawaf Alhazmi; and the third at the crash site in Pennsylvania. Translations of the letter indicate an alarming willingness to die on the part of the hijackers[3].