An artillery shell fired during a Marine Corps demonstration on Saturday detonated prematurely over California's Interstate 5, striking a California Highway Patrol vehicle with debris, authorities said.

The U.S. Marine Corps' live-fire from Camp Pendleton as part of its 250th birthday celebration will cause Interstate 5 to be closed for four hours on Saturday.

Highway patrol announces last-minute, multihour closure due to military celebration including 155-mm artillery shells

Shrapnel fragments rained on vehicles parked on Interstate 5 including highway patrol and JD Vance’s detail

An artillery shell fired during a Marine Corps demonstration on Saturday detonated prematurely over California's Interstate 5, striking a California Highway Patrol vehicle with…

The incident followed warnings from California Gov. Gavin Newsom about the danger of the demonstration.