An investigation has revealed new details about a military round that exploded over the 5 Freeway last October, scattering metal debris onto traffic below.

An artillery shell fired over Interstate 5 during a live-fire demonstration at Camp Pendleton prematurely exploded, military officials said in a report, calling the incident a "one in a million" ...

The malfunction quickly led to the cancellation of the rest of the display.

A "one in a million" malfunction during a live fire demonstration over Camp Pendleton last October led to a misfire that rained shrapnel on Interstate 5, striking two California Highway Patrol ...