UPDATE: An artillery shell detonated over California’s Interstate 5 during a Marine Corps demonstration on October 20, 2025, striking a California Highway Patrol (CHP) vehicle. The incident unfolded during a high-stakes live-fire event at Camp Pendleton, leading to immediate safety concerns and the cancellation of further demonstrations.
The live shell exploded mid-air, showering debris on the highway where CHP officers were managing traffic. Fortunately, no injuries were reported, but the patrol car sustained damage. CHP officials confirmed the incident in a statement released shortly after the event.
CHP Border Division Chief Tony Coronado, who is also an active Marine, emphasized the unusual nature of the situation, stating, “It is highly uncommon for any live-fire or explosive training activity to occur over an active freeway.” This alarming event raises questions about safety measures in place during military exercises, especially near civilian infrastructure.
The demonstration, part of the U.S. Marine Corps’ 250th Amphibious Capabilities Demonstration at Red Beach, aimed to showcase the Navy-Marine Corps’ operational capabilities. However, the premature detonation of the 155mm artillery round has sparked a comprehensive review of safety protocols. The CHP has filed an internal report, suggesting a thorough after-action review to enhance future coordination among federal, state, and local agencies.
In a statement to CNN, Capt. Gregory Dreibelbis, a Marine Corps spokesperson, confirmed an investigation is underway. He stated, “We are aware of the report of a possible airborne detonation… The demonstration went through a rigorous safety evaluation.” He added that firing has been suspended until further notice.
California Governor Gavin Newsom, who had closed the affected section of I-5 as a precaution, criticized the decision to conduct live-fire training over a busy highway. “This could have killed someone,” Newsom remarked, calling the incident a dangerous oversight by federal authorities. The governor’s press office highlighted the risks involved, sharing a photo of a soldier carrying the large munition.
The incident has intensified tensions between Newsom and President Donald Trump, with Newsom accusing Trump of prioritizing ego over public safety. “Firing live rounds over a busy highway isn’t just wrong – it’s dangerous,” he stated. The ongoing feud between the two has been marked by sharp criticisms, especially regarding military deployments and immigration policies.
As officials work to determine the full impact of this incident, the Marine Corps is expected to reassess its training protocols to prevent similar occurrences in the future. The public’s safety remains a top priority, and authorities are urged to ensure that military exercises are conducted with the highest level of caution.
Stay tuned for further updates on this developing story as investigations continue into the circumstances surrounding the premature artillery detonation.
