Angry Veteran

Murtha, a vocal opponent of the war in Iraq, said at a news conference Wednesday that sources within the military have told him that an internal investigation will show that "there was no firefight, there was no IED (improvised explosive device) that killed these innocent people. Our troops overreacted because of the pressure on them, and they killed innocent civilians in cold blood."

Military officials say Marine Corp photos taken immediately after the incident show many of the victims were shot at close range, in the head and chest, execution-style. One photo shows a mother and young child bent over on the floor as if in prayer, shot dead, said the officials, who spoke to NBC News on condition of anonymity because the investigation hasn't been completed.