Cif Border News Today

Using weapons every bit as deadly as if it were the real thing. the marines were firing 60 millimeter mortars, small bombs, placed into firing tubes that can launch over a mile. instead, the mortar exploded while still in the firing tube. and in a flash, those seven marines were dead and more than half a dozen more wounded. including a navy corpsman. >> a team of investigators has begun the investigation to figure out just what happened. >> reporter: until they find out why, the marine corps wil...