Twelve people have been confirmed injured from the attack.
At least four people have been reportedly killed in a shootout that broke out at a US Navy Yard in Washington.
Reports say at least one gunman opened fire at the facility on Monday. The shooter remained active and was not arrested as of Monday afternoon.
A Washington police spokesman said five people had been shot at the Naval Sea Systems Command headquarters, including a District of Columbia police officer and one other law enforcement officer, the reports say.
There was another report that at least 12 people had been shot, with four killed and eight wounded.
Another Navy official, according to the BBC said more than one shooter may have been involved. The Washington Post reported that there were several shooters.
There are police and emergency vehicles around the complex which is a little more than a kilometre away from U.S. Congress building.
A Navy official was quoted by Reuters as saying a suspected shooter has been contained, adding that several people died and several others were injured. The total number of victims was unclear, he said on condition of anonymity.
The Navy said in a statement the shooting took place at the heavily guarded headquarters, where about 3,000 people work.
President Barack Obama has been briefed on the matter by top officials and has directed federal agencies to co-ordinate their response efforts.
As many as 3,000 people work at the command, which engineers, purchases, builds and maintains ships and submarines for the Navy.
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