US Navy Yard shooting: 2 suspected shooters are down, says US Navy spokesman

Washington: 11:20 am (EDT): US Navy spokesman says two suspected shooters are down.

11:05 am: ATF team that helped take down Boston bombing suspect responding to Navy Yard shooting, says source.

10:55 am: Police describe the Navy Yard Shooting suspect as a tall, adult black male wearing dark clothing.

10:41 am: (EDT) At least 6 Washington DC schools on lock-down following firing at US naval base.

10:39 am: US President Barack Obama informed about the incident.

10:35 am: Flights suspended in and out of Raegan national Airport.

A Defense Department official says several people have been killed and as many as 10 have been wounded in a shooting at the Washington Navy Yard.

The official spoke on condition of anonymity Monday because the official was not authorized to discuss the matter publicly.

The official also says the shooter is "contained" but not yet in custody.

Earlier in the day, the U.S. Navy said it was searching for an active shooter at the Naval Sea Systems Command headquarters, where about 3,000 people work.

The exact number of people killed and the conditions of those wounded was not immediately known.

A defense official, who spoke to The Associated Press on condition of anonymity because he was not authorized to speak during an active attack, also said there were at least several injuries.

The Navy said shots were fired around 8:20 am (local time) at the Naval Sea Systems Command headquarters, where about 3,000 people work.

The number of the victims and their conditions was not immediately known, though the Navy said multiple people had been injured.

Police and federal agents from multiple law enforcement agencies responded to the scene. Ambulances were parked outside, streets in the area were closed and flights at Reagan National Airport were temporarily halted.

A U.S. Park Police helicopter hovered over the building and appeared to drop a basket or a stretcher with a person onto the roof.

Naval Sea Systems Command is the largest of the Navy's five system commands and accounts for a quarter of the Navy's entire budget. It builds, buys and maintains the Navy's ships and submarines and their combat systems.

(With additional information from Associated Press)