Rescue efforts were under way as volunteers used bulldozers to clear wreckage and remove the rubble of the bombed buildings , according to the opposition . Barrel bombs are drums packed with explosives and fuel . They can destroy entire buildings with one hit . Days earlier , Iraqi officials accused ISIL of using chlorine gas in a deadly attack .
Barrel bombs are drums packed with explosives and fuel . They can destroy entire buildings with one hit . Days earlier , Iraqi officials accused ISIL of using chlorine gas in a deadly attack .