A U.S. Marine died during a training exercise at Camp Pendleton on Wednesday afternoon.

The Marine, who was assigned to I Marine Expeditionary Force, died due to injuries sustained in a tactical vehicle mishap during routine training at around 1:45 p.m., according to a news release from Camp Pendleton.

Officials have not yet identified the Marine pending notification of next of kin.

The cause of the vehicle mishap remains under investigation, officials said.

I MEF is an air-ground task force that employs ready forces and formations for "crisis response, forward presence, major combat operations, and campaigns," according to their website .

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