A major US Marine Corps anniversary celebration at Camp Pendleton turned into a public safety and political controversy after a live artillery round exploded prematurely over a closed stretch of California’s Interstate 5. The blast damaged police vehicles and reignited criticism over the decision to conduct live-fire exercises near civilian infrastructure during a high-profile event attended by Vice President JD Vance and Defence Secretary Pete Hegseth .
Artillery mishap over motorway prompts safety investigation
On Saturday, 19 October, a live artillery shell detonated mid-air over a closed portion of Interstate 5 during a military display at Camp Pendleton, north of San Diego. The explosion sent shrapnel raining down onto California Highway Patrol ( CHP ) vehicles stationed on the motorway, including those assigned to Vice President JD Vance ’s security detail.
The CHP confirmed that officers were enforcing a traffic break when the round exploded prematurely overhead. While no injuries were reported, multiple vehicles were damaged. One officer described the sound as “pebbles raining down” on his motorcycle. Shrapnel fragments were recovered, including one that dented the bonnet of a patrol car.
CHP Border Division Chief Tony Coronado described the event as “unusual and concerning,” adding that such exercises are extremely rare above active or even temporarily closed roadways. “As a Marine myself, I have tremendous respect for our military partners, but my foremost responsibility is ensuring the safety of the people of California and the officers who protect them,” he said.
In response, the Marine Corps immediately halted further live firing over the motorway and conducted a sweep of the area to ensure no further hazards remained. The First Marine Expeditionary Force confirmed that the incident involved a 155-millimetre shell and announced that a formal investigation is underway. A statement issued by the unit said the demonstration had undergone a “rigorous safety evaluation” and included “deliberate layers of redundancy”.
Newsom ’s warnings vindicated amid escalating political row
The incident has further intensified political tensions surrounding the event. California Governor Gavin Newsom had previously raised strong objections to the live-fire demonstration, calling it “reckless” and criticising the use of munitions near a major public thoroughfare. On the day of the event, Newsom ordered the closure of a 17-mile stretch of Interstate 5 citing “extreme life safety risk and distraction to drivers, including sudden unexpected and loud explosions”.
After the premature detonation was confirmed, the Governor’s office issued a pointed statement:
“First, you misled Californians about the live munitions being shot over I-5. Then you accused the Governor of overreacting. And now we learn… live ordnance detonated early, striking a vehicle on a closed portion of the motorway.”
Newsom followed up with further criticism on social media, accusing the Trump administration of prioritising political theatre over public safety. “Firing live rounds over a busy motorway isn’t just wrong — it’s dangerous,” he said. “Donald Trump and JD Vance put lives at risk to put on a show.”
He also called for the White House to focus on ending the government shutdown, which has been in effect since the start of October. “If they really want to honour our troops, they should start by paying them and reopening the federal government,” Newsom said.
White house officials defend event as necessary and symbolic
The Camp Pendleton display was the largest of its kind in the continental United States in over a decade. Held to mark the 250th anniversary of the US Marine Corps, the event featured aerial displays, Navy ships, fighter jets, helicopters and a towed howitzer firing live rounds.
Vice President JD Vance, a former Marine who served in Iraq in 2005, used the occasion to speak to hundreds of service members. While he reflected on his personal military experience, much of his speech focused on politics, including criticism of past diversity initiatives in the armed forces and blame for the government shutdown.
“I would not be here today, I would not be the Vice President of the United States, I would not be the man I am today were it not for those four years that I served in the Marine Corps,” Vance said.
“It is our common purpose, it is our common mission and it is the fact that every single person here bleeds Marine Corps green.”
He continued:
“I bring greetings today from our Commander-in-Chief, Donald J Trump, and he wanted me to tell each and every single one of you that he’s proud of you, that he loves you and that despite the Schumer shutdown, he is going to do everything he can to make sure you get paid exactly as you deserve.”
Before news of the mishap emerged, Vance’s office had dismissed Newsom’s concerns as politically motivated. Spokesperson William Martin told reporters that the event was “routine training” and accused the Governor of inflating the risks.
“If Gavin Newsom wants to oppose the training exercises that ensure our Armed Forces are the deadliest and most lethal fighting force in the world, then he can go right ahead,” Martin said.
“It would come as no surprise that he would stoop so low considering his pathetic track record of failure as Governor.”
Aftermath, motorway reopened and safety review underway
The Interstate 5 motorway, which supports around 80,000 vehicles and an estimated $94 million in freight daily, was reopened by mid-afternoon on Saturday. Transport authorities said delays of up to two hours were recorded between San Diego and Los Angeles during the closure.
In the aftermath, the CHP confirmed that the two damaged patrol vehicles were reassigned to continue securing the closed stretch of road. The agency has now called for an after-action review to examine how federal, state, and local authorities coordinate during events involving live ammunition near civilian infrastructure.
“We love our Marines and owe a debt of gratitude to Camp Pendleton,” Newsom wrote separately. “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 has yet to release a timeline for its internal investigation but reiterated that all protocols were followed and no injuries occurred. The demonstration concluded as planned, though the fallout from the incident appears far from over.
Artillery mishap over motorway prompts safety investigation
On Saturday, 19 October, a live artillery shell detonated mid-air over a closed portion of Interstate 5 during a military display at Camp Pendleton, north of San Diego. The explosion sent shrapnel raining down onto California Highway Patrol ( CHP ) vehicles stationed on the motorway, including those assigned to Vice President JD Vance ’s security detail.
The CHP confirmed that officers were enforcing a traffic break when the round exploded prematurely overhead. While no injuries were reported, multiple vehicles were damaged. One officer described the sound as “pebbles raining down” on his motorcycle. Shrapnel fragments were recovered, including one that dented the bonnet of a patrol car.
CHP Border Division Chief Tony Coronado described the event as “unusual and concerning,” adding that such exercises are extremely rare above active or even temporarily closed roadways. “As a Marine myself, I have tremendous respect for our military partners, but my foremost responsibility is ensuring the safety of the people of California and the officers who protect them,” he said.
In response, the Marine Corps immediately halted further live firing over the motorway and conducted a sweep of the area to ensure no further hazards remained. The First Marine Expeditionary Force confirmed that the incident involved a 155-millimetre shell and announced that a formal investigation is underway. A statement issued by the unit said the demonstration had undergone a “rigorous safety evaluation” and included “deliberate layers of redundancy”.
Newsom ’s warnings vindicated amid escalating political row
The incident has further intensified political tensions surrounding the event. California Governor Gavin Newsom had previously raised strong objections to the live-fire demonstration, calling it “reckless” and criticising the use of munitions near a major public thoroughfare. On the day of the event, Newsom ordered the closure of a 17-mile stretch of Interstate 5 citing “extreme life safety risk and distraction to drivers, including sudden unexpected and loud explosions”.
After the premature detonation was confirmed, the Governor’s office issued a pointed statement:
“First, you misled Californians about the live munitions being shot over I-5. Then you accused the Governor of overreacting. And now we learn… live ordnance detonated early, striking a vehicle on a closed portion of the motorway.”
Newsom followed up with further criticism on social media, accusing the Trump administration of prioritising political theatre over public safety. “Firing live rounds over a busy motorway isn’t just wrong — it’s dangerous,” he said. “Donald Trump and JD Vance put lives at risk to put on a show.”
He also called for the White House to focus on ending the government shutdown, which has been in effect since the start of October. “If they really want to honour our troops, they should start by paying them and reopening the federal government,” Newsom said.
White house officials defend event as necessary and symbolic
The Camp Pendleton display was the largest of its kind in the continental United States in over a decade. Held to mark the 250th anniversary of the US Marine Corps, the event featured aerial displays, Navy ships, fighter jets, helicopters and a towed howitzer firing live rounds.
Vice President JD Vance, a former Marine who served in Iraq in 2005, used the occasion to speak to hundreds of service members. While he reflected on his personal military experience, much of his speech focused on politics, including criticism of past diversity initiatives in the armed forces and blame for the government shutdown.
“I would not be here today, I would not be the Vice President of the United States, I would not be the man I am today were it not for those four years that I served in the Marine Corps,” Vance said.
“It is our common purpose, it is our common mission and it is the fact that every single person here bleeds Marine Corps green.”
He continued:
“I bring greetings today from our Commander-in-Chief, Donald J Trump, and he wanted me to tell each and every single one of you that he’s proud of you, that he loves you and that despite the Schumer shutdown, he is going to do everything he can to make sure you get paid exactly as you deserve.”
Before news of the mishap emerged, Vance’s office had dismissed Newsom’s concerns as politically motivated. Spokesperson William Martin told reporters that the event was “routine training” and accused the Governor of inflating the risks.
“If Gavin Newsom wants to oppose the training exercises that ensure our Armed Forces are the deadliest and most lethal fighting force in the world, then he can go right ahead,” Martin said.
“It would come as no surprise that he would stoop so low considering his pathetic track record of failure as Governor.”
Aftermath, motorway reopened and safety review underway
The Interstate 5 motorway, which supports around 80,000 vehicles and an estimated $94 million in freight daily, was reopened by mid-afternoon on Saturday. Transport authorities said delays of up to two hours were recorded between San Diego and Los Angeles during the closure.
In the aftermath, the CHP confirmed that the two damaged patrol vehicles were reassigned to continue securing the closed stretch of road. The agency has now called for an after-action review to examine how federal, state, and local authorities coordinate during events involving live ammunition near civilian infrastructure.
“We love our Marines and owe a debt of gratitude to Camp Pendleton,” Newsom wrote separately. “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 has yet to release a timeline for its internal investigation but reiterated that all protocols were followed and no injuries occurred. The demonstration concluded as planned, though the fallout from the incident appears far from over.
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