Marine Corps Artillery Demonstration Causes Shrapnel Damage to CHP Vehicle on I-5

During a live-fire demonstration at Camp Pendleton on October 18, 2025, commemorating the U.S. Marine Corps' 250th anniversary, shrapnel from an artillery round prematurely detonated over Interstate 5, damaging a California Highway Patrol (CHP) vehicle. The incident occurred around 1:45 p.m. as CHP officers were managing a traffic closure along the freeway to facilitate the military exercise. No injuries were reported.

The Marine Corps had previously assured state officials that the demonstration would not impact public infrastructure. However, the decision to fire live artillery over the freeway led to the closure of a 17-mile stretch of I-5 from Harbor Drive in Oceanside to Basilone Road near San Onofre between 11 a.m. and 3 p.m., affecting approximately 80,000 daily commuters.

California Governor Gavin Newsom criticized the federal government's handling of the event, stating on social media, "We love our Marines and owe a debt of gratitude to Camp Pendleton, but next time, the Vice President and the White House shouldn’t be so reckless with people’s lives for their vanity projects."

The Marine Corps acknowledged the incident and announced an investigation to determine the cause of the premature detonation. A spokesperson stated, "The demonstration went through a rigorous safety evaluation, and deliberate layers of redundancy, to ensure the safety of fellow citizens."

The CHP has requested an after-action review with federal authorities to discuss public safety measures for future events.