Khalid Sheikh Mohammed, who is accused of being the Sept. 11 mastermind, shortly after his capture during a raid in Pakistan in 2003.AP fileMilitary trial date set for alleged mastermind of Sept. 11 attacksKhalid Sheikh Mohammed has been held at Guantánamo Bay since 2006.26 Aug 2026, 23:04 by Courtney Kube, Mosheh Gains and Kyla Guilfoil | NBC News · 5 NBCDFW