Navy Yard Shooting

A law enforcement officer aims his rifle to a building as he responds to a reported shooting at an entrance to the Washington Navy Yard September 16, 2013 in Washington, DC. According to the latest news report several people were shot with the shooter still possibly active. (Photo by Alex Wong/Getty Images)

13 Dead In Washington Navy Yard Shooting; 2nd Gunman Sought

At least one gunman opened fire inside a building at the Washington Navy Yard on Monday morning, and officials said several people were killed and as many as 10 were wounded, including a law enforcement officer.