4 marines killed during range maintenance operation in Cali. - KYTX CBS 19 Tyler Longview News Weather Sports

4 marines killed during range maintenance operation in Cali.

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(CNN) -- Four Marines were killed Wednesday during a range maintenance operation at Camp Pendleton in California, the military said.

The incident was the deadliest for Pendleton since seven Marines were killed in a February 2012 midair collision between helicopters along the Arizona-California border, said a military spokesman. Six of them were based at Camp Pendleton, California, and the other was from Yuma, Arizona, the Marines said then.

Their names of the four Marines killed this week weren't immediately released because their families were still being notified, the Marines said.

The four Marines were working in a range area used for live-fire exercises, but the deaths didn't occur under such live fire, said a military spokesman who asked not to be identified while the matter is under investigation. The incident could have "very possibly" involved unexploded ordnance suddenly detonating, the spokesman said.

The range is known as Zulu Black, a Marine spokesman said.

The deaths are under investigation, the Marines said.

"We offer our heartfelt prayers and condolences to the families of the Marines lost today in this tragic accident. Our first priority is to provide the families with the support they need during this difficult time," Brig. Gen. John W. Bullard, commanding general of Camp Pendleton, said in a statement.

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