The US military has named all six crew members who were killed when their refuelling aircraft crashed in Iraq.

The Pentagon said the airmen on board the KC-135 plane were: John Klinner, 33, from Alabama; Ariana Savino, 31, from Washington; Ashley Pruitt, 34, from Kentucky; Seth Koval, 38, from Indiana; Curtis Angst, 30, from Ohio; and Tyler Simmons, 28, also from Ohio.

The first three were Air Force personnel, and the latter three served in the National Guard.

The US military previously said neither hostile nor friendly fire were involved in the loss of the plane in western Iraq on Thursday.