Officials now believe a man who opened fire and killed a dozen at the U.S. Navy Yard in Washington, D.C. Monday morning may have acted alone. Nearly 14 hours after Aaron Alexis allegedly opened fire at the military installation, authorities lifted a "shelter-in-place" order for the community saying they no longer believe there is a second suspect.
Washington, D.C. Mayor Vincent Gray says the 12 shooting victims range in age from 46 to 73 years old. The gunman, identified as 34-year-old Aaron Alexis, was also killed.
Alexis, 34, of Texas, was allowed on to the base Monday morning because he was a information technology contractor working for the defense department, officials say. Investigators are likely looking into how he was able to carry firearms with him.
The shooting is believed to have started near a cafeteria, where workers were gathering for breakfast.
A total of 13 people, including Alexis, died in the shooting. The names of the other victims were expected to be released after their families were notified.
President Barack Obama is mourning what he called "yet another mass shooting" in the United States that he says took the life of American patriots. Obama promised to make sure "whoever carried out this cowardly act is held responsible."
Police and emergency crews gathered Monday morning outside the Naval Sea Systems Command Headquarters building, where the shooting was reported.
Naval Sea Systems Command is the largest of the Navy's five system commands and accounts for a quarter of the Navy's entire budget. It builds, buys and maintains the Navy's ships and submarines and their combat systems.
Alexis was a former Navy reservist, serving from 2007 to early 2011. His motive for the shooting was not immediately clear.
The FBI is asking anyone with information about Alexis to call them at 1-800-CALL-FBI.
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