Dick Cheney, US vice-president, has endorsed the use of "water boarding" for terror suspects and confirmed that the controversial interrogation technique was used on Khaled Sheikh Mohammed, the senior al-Qaeda operative now being held at Guantánamo Bay.

Mr Cheney was responding to a conservative radio interviewer who asked whether water boarding, which involves simulated drowning, was a "no-brainer" if the information it yielded would save American lives. "It's a no-brainer for me," Mr Cheney replied.