Two U.S. Black Hawk helicopters collided while landing at an American combat outpost in northern Baghdad, the U.S. military said. One Iraqi soldier was killed and two American and two Iraqi soldiers were injured, military spokesman Lieutenant Patrick Evans said ."Two UH-60 Black Hawks have crashed while landing at Combat Outpost Ford in (the northern Baghdad district of) Adhamiya " he said."The situation is under control. Emergency services are on the scene. It is unknown how many were on board at the time of the incident. Enemy fire is not suspected at this time."Iraqi police confirmed the crash. They gave no further details, but said clashes had broken out between Iraqi security forces and gunmen near the crash site. But the U.S. military said the crash had taken place at its base and it was not aware of any clashes in the area.