4 die as an United States Air Force aircraft crashes in Afganistan

An U.S Air force aircraft crashed killing all four on-board. It was reported that 3 where American service members and one was a civilian, and the aircraft was a CV-22 Osprey which is a hybrid aircraft with rotors. It can land and take off as similar as an chopper would do as well as like a fixed wing. The cause for the crash is still unknown.