Police work the scene on M Street, SE in Washington near the Washington Navy Yard on Monday, Sept. 16, 2013. The U.S. Navy says one person is injured after a shooting at a Navy building in Washington. Police and emergency crews gathered Monday morning outside the Naval Sea Systems Command Headquarters building, where the shooting was reported (Photo: AP)
A gunman shot and wounded at least four people Monday, including a police officer, at the US Navy Yard in Washington, and was still at large, officials and media reported.
A Washington DC police officer had been shot near the room where the gunman, armed with an assault rifle, had barricaded himself at a headquarters building at the Navy Yard grounds, the Washington Post and local media reported.
The US Navy said "several" people had suffered injuries.
"Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel," the navy said in a statement.
Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter.
The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command.
About 3,000 people work at the headquarters, which is responsible for building and buying US warships and combat systems, the navy said.
The complex also has a residence which serves as the home of the chief of the US Navy.
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