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27 October 2025

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

John Ismay, Laurel Rosenhall and Zolan Kanno-Youngs

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.

Mr. Newsom had warned that the Marine Corps’ plans to fire artillery shells over Interstate 5, the West Coast’s main north-south artery, could pose hazards for motorists on the stretch between Los Angeles and San Diego. The closure he ordered on Saturday caused significant backups on the portion of the interstate, which is used by approximately 80,000 people daily.

“We love our Marines and owe a debt of gratitude to Camp Pendleton, but next time, the vice president and the White House shouldn’t be so reckless with people’s lives for their vanity projects,” Mr. Newsom said in a statement to The New York Times.

Lt. Col. Lindsay Pirek, a spokeswoman for the First Marine Expeditionary Force at Camp Pendleton, said the Corps was aware of the report of a possible airborne detonation, and an investigation was underway.

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