Osama bin Laden - considered the mastermind behind the September 11 , 2001 , destruction - had begun sending operatives to flight training schools in the United States . A number of these American-trained operatives wound up piloting the planes used as weapons in the attacks , but officials at FBI headquarters in Washington , D .C , did not see the memo until after September 11 (Lichtblau , 26-27 July 2003 . Furthermore , although the CIA suspected in March 2000 that Khalid al-Midhar and Nawaf Alhazmi , both of whom...
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