Police respond to a shooting at the Navy Yard in Washington, DC, September 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
Police respond to a shooting at the Navy Yard in Washington, DC, September 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
Emergency vehicles and law enforcement personnel respond to a shooting at an entrance to the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
Two DC Metro Police officers put their gear up as they respond to a shooting at an entrance to the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
Police respond to a shooting at the Navy Yard in Washington, DC, September 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
Law enforcement personnel respond to a shooting at an entrance to the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
A law enforcement officer aims his rifle to a building as he responds to a shooting at an entrance to the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
A general view shows police and first responder activity on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. (credit: MANDEL NGAN/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
Snipers take their positions on the roof of a building at the Navy Yard complex where a shooting took place on September 16, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images
Deadly Shooting At Washington Navy Yard
A Park Police helicopter carries a sniper to the roof of a building on the Navy Yard complex where a shooting took place on September 16, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images)
Deadly Shooting At Washington Navy Yard
A Maryland State Police helicopter lands on the 11th Street Bridge adjacent to the Navy Yard complex where a shooting took place on September 16, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images)
Deadly Shooting At Washington Navy Yard
Armed ATF agents stage on the 11th Street Bridge adjacent to the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images)
Deadly Shooting At Washington Navy Yard
Armed ATF agents stage on the 11th Street Bridge adjacent to the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images)
Deadly Shooting At Washington Navy Yard
Law enforcement personnel respond to a shooting at the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
Law enforcement personnel respond to a shooting at the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
An unmarked helicopter approaches for a landing on the Route 295 bridge, now a police landing zone, over the Ancostia River near the US Navy Yard on September 16, 2013 in Washington,DC. (credit: PAUL J. RICHARDS/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
A policeman directs a man off a sidewalk on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. (credit: MANDEL NGAN/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
A US Park Police helicopter patrols over the US Navy Yard September 16, 2013 in Washington, DC. (credit: PAUL J. RICHARDS/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
A police officer inspects vehicles with his canine at a parking lot outside the Washington Navy Yard as he responds to a shooting September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
An armored personnel carrier speeds down M Street, SE away from the Washington Navy Yard on September 16, 2013 in Washington, DC. (credit: MANDEL NGAN/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
Police respond to a shooting at the Navy Yard in Washington, DC, September 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
A heavily armed police officer patrols a parking lot outside the Washington Navy Yard as he responds to a shooting September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
A US Park Police helicopter patrols over the US Navy yard September 16, 2013 in Washington, DC. (credit: PAUL J. RICHARDS/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
A woman talks on the phone after she walked out of a building on M Street, SE near the Washington Navy Yard on September 16, 2013 in Washington, DC. (credit: Mandel Ngan/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
Heavily armed police officers respond to a shooting at the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
People exit a building with their hands above their heads as police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. (credit: SAUL LOEB/AFP/Getty Images)
Deadly Shooting At Washington Navy Yard
People come out from a bulding with their hands up after a shooting happened at the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
People come out from a bulding with their hands up after a shooting happened at the Washington Navy Yard September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)
Deadly Shooting At Washington Navy Yard
A police helicopter circles around above the Washington Navy Yard after a shooting rampage happened September 16, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images)