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Four presumed dead after Marine helicopter crashes in Southern California

The CH-53E crashed during a routine training mission, the Marine Corps said.

All four people aboard a CH-53E Super Stallion helicopter that crashed Tuesday afternoon in Southern California are presumed dead, the Marine Corps said Tuesday night.

The names of the victims weren't made public pending positive identification and notification of their families. The helicopter was assigned to the 3rd Marine Aircraft Wing at Marine Corps Air Station Miramar, north of San Diego.

The Marine Corps said the helicopter was on a routine training mission when it went down at about 2:35 p.m. local time (5:35 p.m. ET) near El Centro, about 10 miles from the Mexican border near the city of Mexicali.

The CH-53E is largest and heaviest helicopter in the U.S. military. The region is home to Naval Air Facility El Centro, which said the Navy was working with the Marine Corps investigation.