A series of interviews, audio and videotapes were released in the years following the 9/11 attacks that were reported to be from Osama bin Laden.
Richard Clarke, who headed the government's anti-terrorism efforts in 2001, theorized CIA director George Tenet ordered the agency to withhold information about Nawaf al-Hazmi and Khalid al-Mihdhar from the rest of the government in an effort to cover up the agency's recruitment of the two.