The Defense Intelligence Agency (DIA) in Washington, DC apparently destroys duplicate copies of documentation relating to a military intelligence unit called Able Danger, for unknown reasons. The documents had been maintained by one of the DIA’s employees, intelligence officer Anthony Shaffer. [US Congress, 9/21/2005] The Able Danger unit was established in fall 1999, to assemble information about al-Qaeda networks worldwide (see Fall 1999). Lt. Col. Anthony Shaffer had served as a liaison officer between the unit and the DIA. [New York Times, 8/17/2005; Guardian, 8/18/2005] Able Danger allegedly identified Mohamed Atta and three other future 9/11 hijackers more than a year before the attacks (see January-February 2000). Other records relating to the unit were destroyed in May and June 2000, and March 2001 (see May-June 2000). [US Congress, 9/21/2005; Fox News, 9/24/2005]