NATO investigators believe that 30 civilians were killed in a controversial U.S. airstrike in Afghanistan's Kunduz province, a preliminary finding that could spark new pressure for disciplinary actions against the German and American personnel involved in the attack.

A team of military officers led by Canadian Maj. Gen. C.S. Sullivan spent more than a week probing the Sept. 4 bombing, which took place after a German commander in Kunduz ordered an airstrike on two hijacked fuel trucks that he feared would be used in a suicide attack against his troops.