From nbc news world headquarters, this is nbc nightly news with brian williams. Tonight the fbi has released the video that was recorded inside the Washington Navy yard complex showing the gunman going about his attack. Weve also learned more about the includes he left behind that speak to the depth of his Mental Illness at the time. The victims loved ones have already seen the video youre about to see. It shows hick stalking the hallways before the hail of gunfire that resulted in 13 victims, including the gunman. Our correspondent starts us off. Reporter good evening. Investigators say aaron alexis believed he was being tormented by a form of radio waves once used by the navy. Cameras inside the Navy Yard Building show aaron alexis carrying the sawedoff shotgun that he used to shoot most of his victims. Mr. Alexis was a mentally unstable individual, and he was able to obtain a firearm two days before he carried out attacks that was planned to kill as many innocent civilians as possib
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