Khalid Sheikh Mohammed, the alleged 9/11 mastermind, is seen shortly after his capture during a raid in Pakistan in March 2003 in this photo obtained by The Associated Press.

His name is Khalid Sheikh Mohammed, and he is the U.S.-educated Pakistani engineer who, as the operational commander of al-Qaida, also orchestrated dozens of other terrorist plots and attacks ...

Five alleged 9/11 plotters, including Khalid Sheikh Mohammed who has been called the mastermind behind the September 11 terrorist attacks, appeared in a military court for a pretrial hearing in ...

The self-described mastermind of the 9/11 attacks, Khalid Sheikh Mohammed, known by his initials KSM, is accepting a plea deal for life in prison. KSM was captured in Pakistan in 2003, before being ...

This photo obtained on March 1, 2003, shows alleged plotter of the September 11, 2001 attack Khalid Sheikh Mohammed. AFP/Getty Images/File. CNN — ...

Tomorrow, Khalid Sheikh Mohammed, the self-confessed mastermind of the 9/11 attacks, and four others will be arraigned at a military tribunal at the Guantanamo Bay U.S. Naval Base. They’ve been ...

The Khalid Sheikh Mohammed he knew was a small man, just 5-foot-4 and maybe 135 pounds. "He had a cute face with a beard. He had a long hair back then.

Khalid Sheikh Mohammed, organizer of the Sept. 11, 2001, attacks, shortly after his capture. Daniel Pearl, another one of his victims. Photo illustration by Slate.

Then, after it murdered bin Laden, the government decided that the true mastermind was Khalid Sheikh Mohammed. In the months following the 9/11 attacks, the government blamed al Qaeda leader Osama ...

The details of Mohammed’s C.I.A. interrogation, described in the report issued earlier this month by the Senate Select Committee on Intelligence, make for grim, even sickening reading.

September 11 plotter Khalid Sheikh Mohammed after his arrest on March 1, 2003. He told interrogators that after 9/11 he knew we would be on the lookout for Arab men.