San Diego • Four Marines were killed Wednesday during an operation to clear a range of unexploded ordnance at Camp Pendleton in San Diego County, a Marine official said.
The deaths occurred during a periodic sweep of explosive material to make ranges safe for future exercises, said a Marine official who spoke on condition of anonymity because he was not authorized to speak publicly.
The identities of the dead were withheld pending notification of relatives. Base officials released no details on the 11 a.m. accident. Authorities were investigating the cause.