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You are going to target over there somewhere you would aim at. but, if he hit both the cinematographer and the director, clearly they were just off camera. maybe he was aging it just slightly off camera. we don't have -- some of the facts we don't know exactly was it during actual filming. walls it during a rehearsal? who was on the set? we don't have enough information. tragic. brian: goes back to brandon lee, the last time we heard about this 1993, bruce lee's son. a dummy round got lodged into the barrel of a gun and fired into his stomach and second dummy round went off. the so-called blan...

>> yeah. >> i believe that you looked into that as well. explain to people how it's possible that shooting a prop weapon could kill one person, could injure another. especially if there is not live ammunition necessarily involved in these prop weapons. >> so when we're dealing with a casing full of gunpowder, gun powder essentially explodes. it turns instantly from a solid to a gas. it creates a tremendous amount of pressure. when it's a blank, simply that pressure is released and some fire and noise with it. that pressure is capable of killing people. john eric hexom was killed by the pressur...

Millimeter mortar shell that somehow exploded, causing this tragedy. now seven military families getting the worst possible news on this day, being notified that their marines were killed in this training accident. carol? >> do they often use live mortars in training exercises? >> well, there is live ammunition training in the u.s. military. it happens. what we don't know is whether this was a live round or some kind of other dummy round, perhaps, you know, a blank, if you will, that somehow also exploded, maybe causing these injuries. the marines just aren't saying yet. all they're telling us...