Marines killed in mid-air collision
Seven United States Marines have been killed in a collision between two helicopters in Arizona.
The mid-air accident happened near the city of Yuma during a training exercise on Wednesday night.
An investigation is being held into how it happened.
The Marine Corps said the collision occurred in a remote portion of the Yuma training range complex.
A Marine spokeswoman told CNN that helicopter teams use the area to because it mimics conditions in Afghanistan.
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