A U.S. Marine Corps report released Friday detailed a “one in a million” malfunction that occurred during a live-fire exercise at Camp Pendleton on October 18. A military round detonated prematurely over the 5 Freeway, scattering metal shrapnel that damaged a California Highway Patrol cruiser and a motorcycle.
Investigation Findings
The investigation determined the round’s fuze detonated early, causing the explosion approximately 1,486 feet in the air and 3,300 feet from the firing location. Shrapnel measured 2 inches by 2½ inches. Investigators found no evidence of fault on the part of military personnel.
Possible causes for the premature detonation included the proximity of the M777 Howitzers – some were positioned as close as 10 to 15 feet apart – or exposure to “anomalous electromagnetic energy.” Investigators contacted the United States Secret Service to determine if electronic countermeasures were in use, but were informed they were not.
Political Fallout
The incident occurred during the Marine Corps’ 250th anniversary celebration, attended by Vice President JD Vance. Prior to the event, President Trump had been scheduled to attend. A 17-mile stretch of the 5 Freeway was closed for approximately half an hour before the 1:46 p.m. Exercise began, disrupting travel for thousands.
The White House initially criticized Governor Newsom for shutting down the freeway, stating the Marines had reported no public safety concerns. Following the detonation, Newsom called for an apology from the Trump administration, characterizing the exercise as “reckless” and a “vanity project.” Diana Crofts-Pelayo, a spokesperson for Newsom’s office, stated the investigation was a welcome contrast to “the dangerous and performative demands” of Vance and Pete Hegseth.
Frequently Asked Questions
What caused the round to detonate prematurely?
The report stated the detonation was likely caused by either the close proximity of the Howitzers or exposure to “anomalous electromagnetic energy,” but investigators were unable to determine a definitive answer.
Were there any injuries as a result of the shrapnel?
According to the report, there were no injuries, but the shrapnel did strike a California Highway Patrol cruiser and a motorcycle near Las Pulgas Road.
Had there been previous issues with the fuze used in the exercise?
The report indicated the M767A1 fuze is “extremely reliable” and had only one previous recorded malfunction, which occurred in 2017.
Given the complexity of the investigation and the lack of a definitive explanation, will future live-fire exercises near civilian areas be re-evaluated?
