The U.S. military demonstration that shot live-fire artillery rounds over Interstate 5 on Saturday dropped metal shrapnel on a California Highway Patrol vehicle, resulting in damage, agency officials said Sunday.

Ordnance fired over Interstate 5 at yesterday's 250th anniversary of the Marine Corps at Camp Pendleton prematurely detonated.

A patrol vehicle was struck by shrapnel from an artillery round that was fired during Saturday's event at Camp Pendleton, officials said.

I-5 closes 11 a.m.–3 p.m. for Marine Corps 250th anniversary live-fire demo at Camp Pendleton; expect major SoCal traffic delays.

A celebration scheduled for this weekend at Camp Pendleton has turned into a national debate between California Governor Gavin Newsom and the Trump administration over potential closures of I-5.

The decision to close Interstate 5 due to live-fire at Camp Pendleton was made early Saturday, a California Highway Patrol official told KPBS.

The U.S. 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.

"Because of the event and closure, drivers should expect delays on Interstate 5 and other state routes throughout Southern California before, during, and after the event," the press release says.