A U.S. helicopter that crashed and killed two soldiers in Iraq's Diyala province Monday was shot down by enemy fire, a senior U.S. military official said Wednesday, according to AP. Brig. Gen. Perry Wiggins, deputy director of operations for the Joint Chiefs of Staff, said the military believes the aircraft was brought down by small arms fire, and the roadside bomb that killed a response team headed to the crash site was not the newer, armor-piercing explosively formed penetrators, or EFPs, that have killed hundreds of U.S. soldiers. Speaking to Pentagon reporters, Wiggins called the assault a «complex attack.» He also said the military continues to «adjust our flight maneuvering and our routes in order to not become predictable and in order to make it more difficult» for the enemy. Two soldiers from Task Force Lightning were killed in the helicopter crash, and six others died in the roadside bomb ambush as they raced to the rescue.