Seven Marines Killed When Helicopters Collide During Training Exercise

February 23, 2012 Updated Feb 23, 2012 at 1:39 PM EDT

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Seven Marines Killed When Helicopters Collide During Training Exercise

February 23, 2012 Updated Feb 23, 2012 at 1:39 PM EDT

According to The Arizona Republic, seven Marines were killed Wednesday night when two helicopters collided in mid-air during a training exercise in Arizona.

An investigation has been launched into the cause of the accident, according to The Arizona Republic report. The Marines were from the 3rd Marine Airwing based out of San Diego, according to the report.

Read The Arizona Republic story HERE.