Al-Qaeda suspects 'tortured often'

Memos released by the US reveal that two senior al-Qaeda suspects were waterboarded more than 200 times.

Khalid Sheikh Mohammed, the self-confessed planner of the 9/11 attacks, was subjected to the technique 183 times.

The method, which simulates drowning, was used on another suspect, Abu Zubaydah, at least 83 times.

Justin Webb reports from Washington.