4 Marines Killed in Training Exercise at Camp Pendleton

Four U.S. Marines were killed at Camp Pendleton in San Diego County Wednesday morning during a range maintenance operation, base officials confirmed.According to Camp Pendleton officials, the deadly incident happened around 11 a.m. At this point, few details have been released about what actually occurred.NBC News reports that a U.S. military official said the incident involved the detonation of some unexploded ordnance on a range at the base. The Marines involved in the accident were Explosive Ordnance Disposal Marines, NBC News reported.
NBC News sources inside the Pentagon said the Marines were not clearing the range, but instead doing some sort of training when the deadly detonation occurred.