Artillery Shell Detonates Over Interstate 5 During Marine Corps Anniversary Event
A live artillery shell prematurely exploded over Interstate 5 during a Marine Corps demonstration, leading to freeway closures and political debate over public safety.
During a live-fire demonstration at Camp Pendleton on October 18, 2025, commemorating the U.S. Marine Corps' 250th anniversary, a 155mm artillery shell prematurely detonated over Interstate 5. Shrapnel from the explosion struck a California Highway Patrol (CHP) vehicle and a motorcycle in Vice President JD Vance's security detail. No injuries were reported, but the incident prompted the cancellation of the exercise and a sweep of the area for additional fragments.
The CHP had closed a 17-mile stretch of I-5 from Harbor Drive in Oceanside to Basilone Road near San Onofre during the event, citing safety concerns. This last-minute closure led to significant traffic disruptions.
Governor Gavin Newsom criticized the federal government's decision to conduct live-fire exercises over a busy freeway, stating, "Firing live rounds over a busy highway isn't just wrong — it's dangerous."
Marine Corps officials maintained that the exercise was safe and routine, asserting that it was unnecessary to disrupt traffic on I-5.
An investigation into the premature detonation is underway to determine the cause and prevent future incidents.
Source
The GuardianFact-checking
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