The U.S. military says two American pilots were killed in a military helicopter crash in northern Iraq, which was likely caused by hostile fire.

A U.S. commander in Iraq, Lieutenant General John Vines, said the aircraft was lost near Mosul, and indicators point to hostile fire as the cause of the crash.

Thursday, the U.S. military predicted an increase in insurgent attacks as the newly elected Iraqi government forms, and final results from last month's general elections are released.

Brigadier-General Don Alston said insurgents may use Iraq's transition to a new government as an opportunity to try to derail the democratic process.