handgun, which he was able to use both. now, we don't know exactly how many of the injuries and fatalities were caused by the shotgun and how many were caused by the handgun. that is something that the fbi is still working on on the scene today. we do know, though, that it was something straight out of a movie. you have a scene where officers are coming into the building and coming under fire. he is running from room to room, and they're pursuing him. it's an incredible scene. >> so he was never holed up in any room inside the building. that's just incredible. >> right. it was a chaotic scene, as you might imagine. >> evan perez, thanks so much. >> so when aaron alexis entered building 197 inside washington's navy yard monday, very few people were likely armed. at least inside the building. because most military personnel are not allowed to carry personal weapons unless there is