The Pentagon says a U.S. airstrike killed more than 100 Iraqi civilians in Mosul in March.
U.S. investigators say at the time of the bombing, coalition forces were fighting against two ISIS snipers posted on the rooftop of a building. The bomb detonated in the second floor of the structure where ISIS fighters had planted explosives. An explosion triggered by the airstrike caused the structure to crumble, killing the two ISIS snipers and 101 civilians in the bottom floors of the structure. Four other civilians were killed in a neighboring structure.
U.S. coalition forces were not aware of the civilians or explosives in the building prior to the airstrike.