Senate Majority Leader Harry Reid , who represents Nevada , called it `` quite a big explosion '' and said the area of the blast was cordoned off as details emerged . Marine say Seven people suffered very serious wounds . Marines temporarily discontinue use of type of mortar round that caused explosion . Unit was undergoing a live fire exercise at a mountain warfare training center . KOLO is 60 mm southeast of Nevada , Nevada .
Marine say Seven people suffered very serious wounds . Marines temporarily discontinue use of type of mortar round that caused explosion . Unit was undergoing a live fire exercise at a mountain warfare training center . KOLO is 60 mm southeast of Nevada , Nevada .