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Marines: ‘One-in-a-million’ malfunction caused explosion over I-5
National Security

Marines: ‘One-in-a-million’ malfunction caused explosion over I-5

The Hill
by Jackie Marquez
March 16, 2026
8 views
3 min read

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The Bottom Line

A Marine artillery shell malfunctioned during a ceremony, exploding over Interstate 5 and hitting a police car.

How This Affects You

Military exercises near highways could pose safety risks if equipment malfunctions send debris onto roads you travel.

AI Summary

The Marine Corps has concluded that a rare artillery shell malfunction caused an explosion over Interstate 5 that sent debris into a California Highway Patrol vehicle during a military commemoration in October 2025. The incident occurred during a 250th anniversary celebration when the shell's fuze malfunctioned in what Marines described as a "one-in-a-million" occurrence, causing the round to detonate prematurely above the highway. The explosion created a dangerous situation on a major California interstate, with debris from the military ordnance striking a law enforcement vehicle below. The investigation reveals the incident was caused by equipment failure rather than human error during what was intended as a ceremonial military display. The findings will likely prompt reviews of safety protocols for military demonstrations conducted near civilian areas and major transportation corridors.

What's Being Done

The findings will likely prompt reviews of safety protocols for military demonstrations conducted near civilian areas.

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