Khalid Sheikh Mohammed, the alleged mastermind behind the September 11, 2001 attacks on the United States, is scheduled to go on trial before a US military court in Guantanamo Bay, Cuba, beginning June 5, 2028. A spokesman for the military court confirmed the trial date on August 27, 2026.

Known as "KSM," Mohammed was considered one of Al-Qaeda leader Osama bin Laden's top lieutenants before his capture in March 2003 in Pakistan. He was held in secret CIA facilities for three years prior to his transfer to the US naval base at Guantanamo Bay in 2006.

Mohammed, a trained engineer who attended university in the United States, has stated that he masterminded the 9/11 attacks "from A to Z." The attacks resulted in nearly 3,000 deaths after hijacked planes crashed into the Twin Towers in New York, the Pentagon in Washington, and a field in Pennsylvania.

In addition to the 9/11 attacks, Mohammed claims involvement in the 1993 World Trade Center bombing, which killed six people, and asserts he personally beheaded US journalist Daniel Pearl in 2002.

The trial has faced multiple delays, and a plea deal that would have removed the death penalty option was withdrawn the previous year. Guantanamo Bay is used by the United States to detain militants captured during the "War on Terror" following the 9/11 attacks, aiming to prevent defendants from claiming rights under US law. At its peak, the facility held approximately 800 prisoners, many of whom have since been transferred to other countries.

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