Sources have confirmed that the gunman that shot and killed several people at the Navy Yard in Washington D.C. has been identified as 34-year old Aaron Alexis of Fort Worth, TX. Story is continuing to develop.

At least twelve people are dead after a shooting Monday morning in a heavily secured building at the D.C. Navy Yard, and authorities now say they have identified the gunman.

That gunman, 34-year-old Aaron Alexis of Fort Worth, Texas, is among the twelve dead. Officials said he recently began working as a civilian contractor.

The FBI, which now is leading the investigation, believes the gunman used the identification of a man who used to work at Navy Yard, reported Pete Williams of NBC News. The ID was found next to his body in Building 197, where most of the victims were shot on the third and fourth floors.

People with proper badges are allowed to enter Navy Yard without having their bags checked, Williams reported.

However, authorities have not completely ruled out the possibility of other gunmen, Metropolitan Police Department Chief Cathy Lanier said at an afternoon press conference. Lanier had said police were seeking a man aged between 40 and 50 years old, who was wearing olive drab and was armed with a “long gun,” though she did not give any other details about the weapon. He was about 5-feet-10-inches tall and 180 pounds, African-American, with a medium complexion and graying sideburns.

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