Human Rights Watch says it has uncovered evidence suggesting that the Bush administration covered up the extent of waterboarding at secret CIA prisons early in the war on terrorism. Officials have long maintained that only three key al Qaeda suspects were subjected to the harsh interrogation technique, which has been widely condemned as torture. But now, Human Rights Watch investigators say they have found two Libyan Islamists who were subjected to similar treatment nine years ago in Afghanistan, before being returned home and imprisoned by Moammar Gadhafi. Was waterboarding more widespread than U.S. officials acknowledge?