Camp Pendleton, CHP
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The artillery rounds were fired over Interstate 5 near Camp Pendleton in San Diego as part of a military demonstration for the Marine Corps' 250th anniversary.
According to California Highway Patrol, the explosive ordinance that was fired over the freeway detonated overhead prematurely, striking and damaging a patrol vehicle.
The 5 Freeway will close for four hours today, Oct. 18, from Harbor Drive to Basilone Road, state officials announced.