Article updated: 3/19/2013 7:02 PM

Pentagon bans 60mm mortar round after deaths

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This May 20, 2005, photo shows storage bunkers at the U.S. Army Depot in Hawthorne, Nev. Seven Marines from a North Carolina unit were killed and several injured in a training accident at the Hawthorne Army Depot.

Associated Press

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A mortar shell explosion killed seven Marines and injured a half-dozen more during a training exercise in Nevada's high desert, prompting the Pentagon to immediately halt the use of the weapon worldwide until an investigation can determine its safety, a military official said Tuesday.