Talk about chilling. The FBI on Wednesday released video of Washington Navy Yard shooter Aaron Alexis entering a building, loading his rifle, and eventually searching nearly empty office space for more victims. The FBI said that Alexis believed he was being controlled by "extremely low frequency" electromagnetic waves. The FBI also released photos related to the shooting, including of his shotgun, with some showing engraved messages on the gun. Some of the messages he sawed into the weapons were “Not What You Say!” and “End the Torment!” The video chronicled Alexis driving his rental car into a parking garage, then walking into the building. He then loaded his gun in an empty hallway and searched offices and other hallways.