Seven U.S. Marines died early Wednesday evening in a helicopter crash over Arizona, the marine corps said in a statement.
Two Marines were aboard one craft, and five Marines were aboard the other when the helicopters collided during training exercises along the Arizona-California border, Lt. Maureen Dooley told CNN.
The collision, which occurred near the Marine Corps Air Station Yuma, involved an AH-1W "Super Cobra" attack helicopter and a UH-1Y "Huey" utility chopper, according to the Pioneer Press.
Identities of the Marines have been withheld until their families have been notified.
Authorities were still investigating the crash Thursday morning.