There was a mass shooting at about 8:15 a.m. at the Washington, D.C. Navy Yard on Monday.
At least 13 people were killed, including the gunman, according to police.
Three others were wounded, including a D.C. police officer. All are expected to recover.
The incident began when a gunman shot a security officer at the headquarters of Naval Sea Systems Command (NAVSEA).
Authorities were looking for two other persons of interest, one of whom has been ruled out as a suspect. The other is a black male reportedly seen wearing a olive military uniform and carrying a rifle.
The F.B.I. confirmed that the deceased gunman was identified as Aaron Alexis, a 34-year-old Navy civilian contractor and former U.S. sailor.
CBS and NBC reported that the gunman entered the building with a shotgun and may have acquired a pistol and an AR-15 rifle. He was reportedly killed by police.
The F.B.I. believes Alexis used a former employee's ID card to enter Building 197, where most of the victims were shot on the third and fourth floors.
A witness told the AP that a gunman was shooting at people in the building's cafeteria on the first floor from a fourth floor ledge in the hallway outside his office.
More than 3,000 people work in the building. Two witnesses spoke with CNN after fleeing the building during the shooting.
Naval Sea Systems Command is the largest of the Navy's five system commands, accounting for a quarter of the Navy's budget, and is in charge of buying and maintaining Navy ships, submarines, and combat systems.
Some schools in the area, as well as much of the area around the Navy Yard, have been locked down all day. Students and workers began leaving mid-afternoon. Streets around the yard remain closed.
The shooting is the worst loss-of-life incident within D.C. borders since 1982 when Air Florida Flight 90 crashed, killing 78 people.
Here's a map of the area:
A couple of photos from the scene:
From one of our staffers sheltering in place in SE DC. #NavyYardShootingpic.twitter.com/UNcWqRLExY
— Tim Hogan (@timjhogan) September 16, 2013
Navy Yard employees evacuated to underground parking deck. pic.twitter.com/YVdwsVQtU8
— Gerritt (@Gerritt) September 16, 2013
Watching the news at the Navy Yard food court. Still locked down. pic.twitter.com/B2PIPcWDqJ
— Gerritt (@Gerritt) September 16, 2013
Here's the White House statement:
WH statement on Navy Yard shooting pic.twitter.com/0zMeigWdqZ
— Zeke Miller (@ZekeJMiller) September 16, 2013
More to come as details become available.