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Artillery Shell Detonated Over Interstate 5 During Marines’ Celebration, California Officials Say

The mishap, during an anniversary celebration for the Marine Corps attended by the vice president and defense secretary, underscores safety concerns that Gov. Gavin Newsom voiced before Saturday’s event at Camp Pendleton.

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A sign over the Interstate 5 highway in Southern California displaying a warning message “Live Weapons Over Freeway.”
A warning over Interstate 5 alerted drivers about the military using live weapons on Saturday.Credit...Patrick Fallon/Agence France-Presse — Getty Images

A 155-millimeter 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 pebbles hitting his motorcycle and the area around him, and two others saw a two-inch piece of shrapnel hit the hood of their patrol vehicle, leaving a small dent. The report says shrapnel was also found on the road near the motorcycle.

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John Ismay is a reporter covering the Pentagon for The Times. He served as an explosive ordnance disposal officer in the U.S. Navy.

Laurel Rosenhall is a Sacramento-based reporter covering California politics and government for The Times.

Zolan Kanno-Youngs is a White House correspondent for The Times, covering President Trump and his administration.

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