One suspected gunman is dead, another may be at large, after the deadly shooting rampage at the Washington Navy Yard. According to the FBI, the dead suspect has been identified by fingerprints and photo ID as 34-year-old Aaron Alexis, a military contractor. His last known address was in Fort Worth, Texas.

We’re digging into Alexis’s background and we’ll have more details on him tonight on 360°. Meanwhile, police have cleared a third man who was originally thought to also be a suspect. Pres. Obama called the shooting a “cowardly act” that targeted civilians and military members serving on the home front. “We don’t know what the motive was at this stage,” Mayor Vincent C. Gray said at a news conference late this afternoon. Here’s the AC360 411 on the shooting spree:

13

The number of people killed in the shooting spree at Washington’s Navy Yard, including the dead suspect.

At least 3

The number of people hospitalized with gunshot wounds.

8:20 a.m. ET

The Navy confirms on its Twitter page that shots were fired at the headquarters for Naval Sea Systems Command, Building 197.

3,000

The number of people who work at the headquarters for Naval Sea Systems Command at Washington’s Navy Yard.

60,000

The worldwide workforce for the command, including civilian, military and contract support personnel. They engineer, buy and maintain the Navy’s fleet and their combat systems, according to the U.S. military.

$30 billion

The annual budget for the command, making up 25% of the Navy’s entire budget.

1799

The year the Yard was created by an act of Congress, making it the oldest shore establishment of the U.S. Navy. It was initially intended as a shipbuilding facility and once serviced the Navy's most famous vessels, including the USS Constitution.

1-800-CALL-FBI

The phone number to call if you have any information on the shooting rampage and/or dead suspected gunman.