A Convention Center billboard asks people to pray for the Marines that will killed in Hawthorne, Nev. on Tuesday March 19, 2013. Military officials say a mortar shell explosion killed seven Marines and injured a half-dozen more during a training exercise in Nevada's high desert. The accident prompted the Marine Corps to immediately halt use of some mortar shells until an investigation can determine its safety. (AP Photo/The Reno Gazette-Journal, Marilyn Newton)

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Hawthorne mourns deaths of 7 Marines

• By ncs-import
• March 21, 2013