BAGHDAD, June 26 (Reuters) - Three U.S. Marines and two interpreters were killed in a suicide bombing at a tribal council meeting in Iraq's Anbar province on Thursday, the U.S. military said. The five were "killed in action against an enemy force in Anbar province," a U.S. military statement said. The U.S. military said earlier that al Qaeda was likely behind the attack in the town of Garma, 30 km (20 miles) northwest of Baghdad. Police have put the death toll from the attack at 20. (Reporting by Adrian Croft; Editing by Dean Yates)