Washington Naval Yard Attacked, 13 dead including one shooter

Washington (CNN) -- The FBI has identified the dead suspect in Monday's shooting rampage at the Washington Navy Yard as Aaron Alexis, a 34-year-old military contractor from Texas.

But authorities are still searching for more information about him, and they're asking members of the public for help.

If you have information regarding Aaron Alexis or the Navy Yard shooting, call 1-800-CALL-FBI or visit the FBI's website.

"No piece of information is too small," said Valerie Parlave, assistant director in charge of the Washington FBI Field Office. "We are looking to learn everything we can about his recent movements, his contacts and associates."

In addition to the gunman, authorities said at least 12 people were killed and about 12 others were injured in the shooting, which put government buildings on lockdown and sent police SWAT teams rushing to the scene.

It's unclear whether another gunman also opened fire at the headquarters for Naval Sea Systems Command -- and why the shooting occurred, Washington Mayor Vincent Gray told reporters.

"We'll continue to seek information about what the motive is. We don't have any reason at this stage to suspect terrorism," he said, "but certainly it has not been ruled out."

Police said one other gunman may be on the loose. Authorities earlier said there could be two gunmen at large, but later said one of them had been cleared.

The other possible suspect described by police -- a black male, between 40 and 50, wearing an "olive drab-colored" military-style uniform -- has not been ruled out, Gray said.

"We still don't know all the facts. But we do know that several people have been shot and some have been killed," President Barack Obama said earlier Monday afternoon. "So we are confronting yet another mass shooting. And today it happened on a military installation in our nation's capital."
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