Seven Marines were killed when two helicopters collided during a routine training exercise in Yuma, Ariz., the Marine Corps announced Thursday.

According to a statement, the crash occurred around 8 p.m. Wednesday in a remote portion of the Yuma Training Range Complex. The two aircrafts in the accident were the AH-1W “Cobra” and the UH-1Y “Huey.”

The Yuma air station said identities of the seven Marines killed will be withheld until their families have been notified, and an investigation of the incident is ongoing.

The Yuma air station has around 4,000 active duty Marines and sailors, with some 2.8 million acres of training grounds, according to its website. Every year, it hosts about 70 aviation units and sees some 600 aircrafts and 14,000 personnel that come through for training.

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