Two helicopters collided in Arizona, killing seven US Marines, military said on Thursday.

Two helicopters collided in Arizona, killing seven US Marines, military said on Thursday.

The accident occurred on a training range near the city of Yuma on Wednesday evening and the troops who died were from the 3rd Marine Aircraft Wing based at Miramar, in southern California.

"The aircraft, an AH-1W 'Cobra' and an UH-1Y 'Huey', were conducting routine training operations" when they collided around 8:00 pm (0300 GMT Thursday), the US Marine Corps said in a statement.

The crash "is currently under investigation," it added.
There were no survivors in the accident, officials said.

The Marines conduct the bulk of their aviation training at the vast Yuma air station in Arizona.