An internal CIA report released this week said Khalid Sheik Mohammed became "one of the U.S. government's key sources on Al Qaeda" -- a breakthrough that intelligence officials reportedly say came after he was subjected to waterboarding by the CIA.

The inspector general's report, released this week, says Mohammed wasn't much help before he was waterboarded but went on to become "one of the U.S. government's key sources on Al Qaeda." Such revelations have fueled the fiery debate over the effectiveness of the CIA's tactics and whether the United States should condone methods that many deem torture.

The CIA report makes it clear that Mohammed wasn't willing to divulge much before interrogators resorted to the controversial tactics.