Four US soldiers were killed after two army helicopters crashed in the aviation training area at a Washington military base

OH-58 Kiowa observation helicopters

Four US soldiers were killed after two army helicopters crashed on Monday in the aviation training area at a Washington state military base southwest of Joint Base Lewis-McChord, Lt. Col. Gary Dangerfield said.

Brendalyn Carpenter, a spokeswoman for Joint Base Lewis-McChord, confirmed that "there was an accident" in the evening and that military police and emergency personnel were en route to the accident scene at the base.

Major General Lloyd Miles, the acting senior Army commander at the base vowed that the military will conduct a thorough investigation into this incident.

The base identified the aircraft involved in the crash as a pair of OH-58 Kiowa observation helicopters. Local television station KIRO 7 reported that the helicopters had crashed in a wooded training area, and that there were no survivors.