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Seven Marines Killed During Firing Exercise in Nevada

ABC News(NEW YORK) -- At least seven U.S. Marines were killed and seven others were injured during a mortar firing exercise in Nevada, the Pentagon said on Tuesday.

The Marines were all from the 2nd Marine Division based at Camp Lejeune, N.C., and were training at the Hawthorne Army Depot, 140 miles southeast of Reno, Nev., when a mortar exploded shortly before 10 p.m. Monday.

"The injured have been transported to area hospitals for treatment and further evaluation," the Marine Corps said in a statement.  Their conditions are not yet known.

Several defense officials say this incident did not appear to involve a round landing on the troops.  An investigation is currently underway.

The identities of the servicemembers will be provided 24 hours after next of kin is notified, the Marine Corps said.

"We send our prayers and condolences to the families of Marines involved in this tragic incident.  We remain focused on ensuring that they are supported through this difficult time," Maj. Gen. Raymond C. Fox said in a statement.  "We mourn their loss, and it is with heavy hearts we remember their courage and sacrifice."

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