Marine Corps Base Camp Pendleton ahead of US Vice President JD Vance's visit on October 18, 2025. Oliver Contreras/AFP/Getty Images

An artillery shell fired as part of the Marine Corps’ 250-year anniversary celebrations prematurely detonated over Interstate 5 in California Saturday, striking a patrol vehicle with shrapnel, according to the California Highway Patrol.

No injuries were reported from the incident, which took place in an area where the highway patrol had stopped traffic during the live fire exercise at Camp Pendleton, the agency said in a statement Sunday.

The Marine Corps was alerted and canceled the firing of additional live ordnance over the highway.

“This was an unusual and concerning situation,” California Highway Patrol Border Division Chief Tony Coronado sa

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