WASHINGTON -- A 155 mm shell fired during a live-fire demonstration for the 250th anniversary of the Marine Corps at Camp Pendleton on Saturday prematurely detonated, dropping fragments of the shell on a California Highway Patrol vehicle and motorcycle that were part of Vice President JD Vance's protective detail, according to a patrol report.

No officers were hurt in the mishap, which dropped shrapnel onto the vehicles parked on a ramp to a major freeway that had been ordered closed by Gov. Gavin Newsom. The governor had objected to the plan to fire over the freeway, Interstate 5, and ordered a 17-mile stretch closed -- against the guidance of military officials, who had said it was safe for it to remain open.

According to the patrol report, one officer described what sounded like pebbl

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