BREAKING: NBC News identifies the suspect in the Washington D. C. Navy Yard shooting as Aaron Alexis, 34, originally of Ft. Worth, Texas. He is a civilian contractor and reportedly used the ID of a former employee to gain access into the facility. Twelve people are dead and several others wounded. The death toll is expected to rise. The potential shooter was described by witnesses as carrying a long gun, which some have said could have been an assault rifle.