Syrian government warplanes bombed a market in a rebel-held town outside Damascus on Sunday, killing at least 82 people in one of the bloodiest regime attacks in the country’s war. The series of strikes on the town of Douma overwhelmed makeshift clinics, with bodies lying side-by-side on a bloodied floor as medics struggled to treat waves of wounded. The head of the Syrian opposition National Coalition, Khaled Khoja, called the attacks a “massacre” and pledged they “will not go unpunished.” The Syrian Observatory for Human Rights, a UK based monitoring group, said regime warplanes had carried out at least 10 strikes on Douma, most of them hitting the market place. It said at least 250 were wounded, with civilians accounting for most of the dead, and the toll could rise further because many of the injured were in a serious condition. Observatory director Rami Abdel Rahman said locals had gathered after a first strike hit the market to help evacuate the wounded when more attacks came. Rahman said the attack was among the bloodiest regime strikes in Syria’s conflict.