In March 2007 , after four years in captivity , including six months of detention and alleged torture at Guantanamo Bay , Khalid Sheikh Mohammed — as it was claimed by a Combatant Status Review Tribunal Hearing in Guantanamo Bay — confessed to masterminding the September 11 attacks , the Richard Reid shoe bombing attempt to blow up an airliner over the Atlantic Ocean , the Bali nightclub bombing in Indonesia , the 1993 World Trade Center bombing and various foiled attacks . " I was responsible for the 9/11 operation from A to Z , " Khalid Sheikh Mohammed said in a statement read Saturday during a Combatant Status Review Tribunal at the Guantanamo Bay detention camp . His confession was read by a member of the U.S. military who is serving as his " personal representative . " According to the " unclassified summary of evidence " presented during the CSRT hearing , a computer hard drive seized during the capture of Khalid Sheikh Mohammed contained the following : At the hearing , Khalid Sheikh Mohammed said the computer belonged not to him , but to Mustafa Ahmad al-Hawsawi , arrested together with him
September 11 attacks
September 11 attacks
Khalid Sheikh Mohammed