FBI Holds News Conference To Update Investigation Into Navy Yard Shooter

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In this handout frame grab from the Washington Navy Yard provided by... News Photo2013 Washington Navy Yard Shooting,Aaron Alexis,Adult,Backpack,Bathroom,FBI,Gripping,Holding,Horizontal,Law,Mass Murder,Men,USA,Violence,Washington DC,Washington Navy YardPhotographer Collection: Getty Images News 2013 FBIWASHINGTON, DC - SEPTEMBER 16: In this handout frame grab from the Washington Navy Yard provided by the FBI on September 25, 2013, Aaron Alexis backpack is found in the fourth-floor mens bathroom, hanging on the back of a stall door September 16, 2013 in Washington, DC. The FBI investigation indicates that the gunman, Aaron Alexis, acted under the delusion that he was being controlled by extremely low frequency (ELF) electromagnetic waves when he carried out his attack on the Navy Yard, in which 12 people were killed and 4 were wounded. (Photo by FBI via Getty Images)