Marines say two people suffered very serious wounds . Another Marine was treated and released . Marines temporarily discontinue use of piece of mortar round that caused explosion . Unit was undergoing a live fire exercise at a mountain warfare training facility . The Hawthorne Army Depot is about 30 miles southeast of Reno , Nevada .
Marines say two people suffered very serious wounds . Marines temporarily discontinue use of piece of mortar round that caused explosion . Unit was undergoing a live fire exercise at a mountain warfare training facility . The Hawthorne Army Depot is about 30 miles southeast of Reno , Nevada .