The man believed to be the key planner of the terrorist attacks of September 11, 2001 -- and several al Qaeda attacks in the past five years -- was among three terrorism suspects arrested in a CIA-led operation early Saturday in a house outside the Pakistani capital.
The arrest of Khalid Shaikh Mohammed is the single most important in the war on terror since September 11, said a law enforcement official close to the investigation.
He was arrested along with a Pakistani political leader, Ahmed Abdul Qadoos, and a man of Middle Eastern origin, Pakistani government officials said.
Mohammed was no longer in Pakistan as of late Saturday, the officials said. It was not known where Mohammed was or who had custody of him.