Shrapnel from artillery rounds fired by the U.S. Marine Corps during a celebration in front of Vice President JD Vance and Secretary of War Pete Hegseth detonated prematurely and struck a patrol car.

Axar.az informs, citing ABC news, the artillery rounds were fired over Interstate 5 near Camp Pendleton in San Diego County as part of a military demonstration for the Marine Corps' 250th anniversary.

A 17-mile stretch of the busy freeway that connects Los Angeles to San Diego was shut down during the event by the California Highway Patrol. The stretch of freeway is typically used by over 80,000 people every day, according to the agency.

California Gov. Gavin Newsom’s office said it was notified by the federal government Saturday morning that the military planned to shoot live artillery over the heavily traveled freeway, prompting highway patrol officers to temporarily close the freeway.

For hours on Saturday, drivers in Southern California were stuck in gridlock on the freeway or had to take lengthy detours.

During that time, shrapnel allegedly rained down on the freeway in the closure zone, according to CHP.

In a police report obtained by ABC News, CHP says a patrol SUV was struck with shrapnel. That SUV had “an approximate two-inch by half-inch piece of shrapnel on the hood of the patrol vehicle," according to the report.

The agency says in the report that the shrapnel made a dent in the hood.

Additionally, patrol officers stated an officer working the freeway closure heard "what sounded like 'pebbles' falling on his CHP BMW motorcycle."

CHP says it immediately alerted the Marine Corps that a mortar round did not clear Interstate 5 and that shrapnel was falling around the freeway. At that point, the Marine Corps, according to the CHP, immediately cancelled firing additional live ordinance over the freeway.