Walid Bin Attash

September 11: The ‘Mastermind’ behind the terrorist attacks to plead guilty 23 years later

Khalid Sheikh Mohammed, the Pakistani national characterized as the mastermind behind the September 11, 2001, attacks on New York and the Pentagon, was arrested in 2003 and transferred to the U.S. military prison at Guantanamo Bay, where he has been held since 2006.

Khalid Sheikh Mohammed, 9/11 mastermind, agrees to plead guilty

Khalid Sheikh Mohammed, accused as the main plotter in al-Qaeda's Sept. 11, 2001, attacks has agreed to plead guilty, the Defense Department has said.

He and two accomplices, Walid Bin Attash and Mustafa al-Hawsawi, are expected to enter the pleas at the military commission at Guantanamo Bay, Cuba, as soon as next week.