A mortar shell explosion killed seven Marines and injured a half-dozen more during mountain warfare training in Nevada's high desert, prompting the Pentagon to immediately halt the use of some of the

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A mortar shell explosion killed seven Marines and injured a half-dozen more during mountain warfare training in Nevada's high desert, prompting the Pentagon to immediately halt the use of some of the weapons worldwide until an investigation can determine their safety, officials said Tuesday.

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WLS – Chicago
Tue, Mar 19, 2013 5:24 PM EDT