Four U.S. Marines were killed Wednesday when unexploded ordnance blew up after a training accident at Camp Pendleton, Calif., military officials said.
The deadly accident occurred during a “range maintenance operation,” the Marine Corps said in a statement. It gave no details and said none of the victims would be identified pending notification of their families.
A U.S. military official told NBC News that the Marines had just finished taking part in exercises about 11 a.m. (2 p.m. ET) when unexploded ordnance detonated. A spokesman for the base told NBC San Diego that while the incident happened in an area where Marines fire artillery and drop bombs from aircraft, there was no firing going in that area at the time.