A U.S. helicopter crashed during a routine training mission in Jordan, injuring two pilots on board, the U.S. military announced Saturday.

The crash occurred Friday night in an uninhabited area south of Al Qatranah, some 80 km south of the capital Amman, the U.S. military said in a statement.

The injured pilots, who had been flying an AH-1W Super Cobra helicopter, were treated at the scene and then flown to Amman for further tests, said the statement, adding they were in stable condition, with one expected to be released soon and the other transferred to a U.S. medical facility.

The helicopter was participating in exercise Infinite Moonlight, an annual exercise between U.S. and Jordanian forces, according to the statement.

The cause of the accident is under investigation.