A British soldier fired a volley of bullets into the "twitching" bodies of Iraqis after a firefight, a public inquiry has heard.
Former army private Duncan Aston told the Al-Sweady Inquiry he also saw a fellow private stamp on the head of a dead Iraqi, and other comrades punch and kick a detainee.
But he did not report the incidents, because he did not want to "grass" on his friends, he said.
Mr Aston, who was serving with the 2nd Battalion the Princess of Wales's Royal Regiment (2PWRR), said his platoon sergeant demanded his weapon from him then opened fire on the bodies.
The Al-Sweady Inquiry is examining allegations that British troops mistreated and unlawfully killed Iraqi detainees after the Battle of Danny Boy in southern Iraq in May 2004.