At least 20 prisoners, mostly top al Qaeda suspects, were subjected to beatings and mock executions, according to the New York Times. This includes a technique known as "water boarding", where the suspect is strapped down and forcibly held under water until he believes he is drowning. The new revelations mark a significant deepening of the crisis of Iraq faced by President Bush and Tony Blair. In a closed-door session in Washington, senators and congressmen saw more than 1,600 photos which they said depicted forced sex, brutality and dogs snarling at cowed prisoners. Some members of Congress said they feared that making the images public would inflame international outrage and endanger Americans in Iraq. The private screening came the day after Islamic militants broadcast film of an American hostage being beheaded in Iraq.