The Pentagon has issued a freeze on all use of 60 mm mortar rounds and has announced that the death toll from the mortar accident has increased from seven to eight Marines; another seven Marines were injured, four critically.
A sign telling residents about a memorial service is posted at the Convention Center in Hawthorne, Nev., on Tuesday, March 19. At the nearby Hawthorne Army Depot, eight Marines were killed and seven others seriously injured in a training accident Monday night.
Scott Sonner/AP
EnlargeA mortar shell explosion killed eight Marines and injured seven more during mountain warfare training in Nevada's high desert, prompting the Pentagon to immediately halt the use of the weapons until an investigation can determine their safety, officials said Tuesday.
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The explosion occurred Monday night at the Hawthorne Army Depot, a sprawling facility used by troops heading overseas, during an exercise involving the 2nd Marine Expeditionary Force from Camp Lejeune, N.C. Several Marines from the unit were injured in the blast, authorities said.
The mortar round exploded in its firing tube during the exercise, Brig. Gen. Jim Lukeman said at a news conference at Camp Lejeune. He said investigators were trying to determine the cause of the malfunction.
The Pentagon expanded a temporary ban to prohibit the military from firing any 60 mm mortar rounds until the results of the investigation. The Marine Corps said Tuesday a "blanket suspension" of 60 mm mortars and associated firing tubes is in effect.
The Pentagon earlier had suspended use of all high-explosive and illumination mortar rounds that were in the same manufacturing lots as ones fired in Nevada.
It was not immediately clear whether more than a single round exploded, a Marine Corps official said, speaking on condition of anonymity because the official wasn't authorized to speak about an ongoing investigation.
The Marine Corps said early Tuesday that seven Marines were killed. Eight men under the age of 30 were taken to Renown Regional Medical Center in Reno. One of them died, four were in serious condition, two were in fair condition and another was discharged, said spokesman Mark Earnest.
John Stroud, national junior vice commander in chief for the Veterans of Foreign Wars, began a memorial event in Hawthorne on Tuesday night by saying "one of the critical has passed," bringing the death toll to eight. Mourners then laid eight floral arrangements at a park where a flag flew at half-staff within sight of the Hawthorne depot's boundary.
Stroud said he spoke with Marine officers from Camp Lejune who gave him the news before the ceremony. Messages left for a spokesman for the 2nd Marine Expeditionary Force were not immediately returned.
The force did issue a statement Tuesday evening saying an additional Marine has been reported as injured.
The identities of those killed won't be released until 24 hours after their families are notified.
"We send our prayers and condolences to the families of Marines involved in this tragic incident," said the force's commander, Maj. Gen. Raymond C. Fox. "We mourn their loss, and it is with heavy hearts we remember their courage and sacrifice."
The rescue was complicated by the remoteness of the site, which is favored because the harsh geography simulates conditions in Afghanistan.
The 60 mm mortar is a weapon that traditionally requires three to four Marines to operate, but it's common during training for others to observe nearby. The firing tube is supported in a tripod-like design and fires roughly a 3-pound shell, some 14 inches in length and a bit larger than 2 inches in diameter.
The mortar has changed little since World War II and remains one of the simplest weapons to operate, which is why it is found at the lowest level of infantry units, said Joseph Trevithick, a mortar expert with Global Security.org.
"Basically, it's still a pipe and it's got a firing pin at the bottom," Trevithick said. Still, a number of things could go wrong, such as a fuse malfunction, a problem with the barrel's assembly, or a round prematurely detonating inside the tube, he said.
The Marine Corps official said an explosion at the point of firing in a training exercise could kill or maim anyone in or near the protective mortar pit and could concussively detonate any mortars stored nearby in a phenomenon known as "sympathetic detonation."
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