US suffered its largest causality in the war against ISIS, when a US Army Pave Hawk helicopter crashed in the Western Iraq, killing all the seven on board.

At approximately 6:45 p.m. GMT on Thursday, March 15 the U.S. HH-60 Pave Hawk helicopter crashed in the city of Qaim.

"All personnel aboard were killed in the crash," said Brig. Gen. Jonathan P. Braga, director of operations, Combined Joint Task Force - Operation Inherent Resolve. "This tragedy reminds us of the risks our men and women face every day in service of our nations. We are thinking of the loved ones of these service members today."

An accompanying U.S. helicopter immediately reported the crash and a quick reaction force comprised of Iraqi Security Forces and Coalition members secured the scene.