great deal of evidence in this investigation. ail that evidence, every stitch of it needs to be analyzed and it will be, whether it s in our foreign six lnsic laboratory or department or other didn ts. joining me now is michael isikoff. late this afternoon we had another briefing with lieutenant vance with some shocking information that potentially this could have been even worse. the gunman had a tremendous amount of fire power with him, right? reporter: absolutely, chris. hundreds of shots were fired in that school by adam lanza, using that bushmaster semiautomatic weapon with multiple high-capacity 30-round magazines that allowed him to shoot repeatedly, not having to reload, 30 shots each time. that is a stunning disclosure by