The U.S. military has confirmed for the first time that the four U.S. helicopters that recently crashed in Iraq were likely downed by enemy fire. Twenty Americans died in the crashes. On Sunday, video appeared online reportedly showing one of the helicopters being shot down.

Major General William Caldwell: “There’s been an ongoing effort ever since we’ve been here to target our helicopters, obviously. Based on what we’ve seen, we are already making adjustments in our tactics, techniques and procedures as to how we employ our helicopters in support of Iraqi security forces and coalition forces, and we are making those appropriate changes.”