In its worst Baghdad assaults for months, ISIS forces Sunday seized Iraqi military positions in Abu Ghraib on the western outskirts of Baghdad, killing at least 17 troops; and sent two suicide bombers on booby-trapped motorbikes to blow up the Shiite district, killing 70 people and injuring at least 100. The Abu Ghraib assault, launched by jihadists driving Humvees and pickup trucks with fixed machine guns, put the Iraq forces to retreat for several hours. Iraqi army helicopters were finally brought in to bombardi them.