Military intelligence officers abused inmates at Abu Ghraib prison in Baghdad, according to witnesses testifying at a military hearing that is examining whether low-ranking military police were following orders when they humiliated detainees.

While several military intelligence officers appeared in one of the Abu Ghraib photographs which showed soldiers standing around a human pyramid of naked Iraqis most of the attention has so far focused on the role of seven military police who have been charged over the abuses.