A training exercise turned tragic Monday night when seven U.S. Marines were killed and at least seven more injured after a mortar exploded at an Army munitions depot in Nevada. It’s still unclear exactly what happened. One account says that the mortar shell exploded in a tube while the Marines were preparing to fire it, while another says the shell exploded while they were preparing to load it. The training facility where the disaster took place is for Special Operations Forces preparing to head to the Middle East.
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