The "mastermind" of the September 11, 2001 attacks will be tried in 2028 by a military tribunal. He has been held at Guantanamo since 2006.

The military tribunal has set June 2028 for the trial of Khalid Sheikh Mohammed, considered the "mastermind" of the September 11, 2001 attacks. He was captured in March 2003 in Pakistan and is accused of war crimes and the murder of 2,976 people.

Mohammed devised the plan to train pilots to crash commercial airplanes into symbolic buildings in the U.S., presenting the idea to Al-Qaeda leader Osama bin Laden. After his capture, he was transferred to Guantanamo in 2006, where he remains incarcerated, having a history of torture interrogations in the CIA's secret prisons in Poland. In July 2025, an American appeals court overturned a plea deal that could have spared him from the death penalty.