Seven US Marines were killed when two helicopters collided during a night training exercise at an Arizona base, the military said Thursday. The crash occurred on Wednesday evening "along the California/Arizona border just outside of the Yuma Training Range Complex," the US Marine Corps said in a statement. 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 Marine Corps said.