The live-fire demonstrations were part of a celebration of the Marine Corps' 250 anniversary. Gov. Newsom has criticized plans to fire live munitions over Interstate 5.

The Marines Corps has launched an investigation after the California Highway Patrol said shrapnel from an artillery shell, fired during a live-fire demonstration touted by the White House, struck a law enforcement vehicle.

No injuries were reported when an artillery round “detonated overhead prematurely” during Saturday’s 250th anniversary celebration for the Marines Corps at Camp Pendleton, the highway patrol said.

But at least one of its patrol vehicles, on hand to help stop and divert traffic on Interstate 5 through the base during the demonstration, was damaged, the highway patrol said in a statement Sunday.