Marines say two people suffered very serious wounds . The attack occurred at a checkpoint in the town of al-Hawl on Saturday morning. Unit was undergoing a live fire exercise at a mountain warfare training center . The Hawthorne Army Depot is about 140 miles southeast of Reno , Nevada .
Marines say two 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 . The Hawthorne Army Depot is about 140 miles southeast of Reno , Nevada .