BREAKING: Active Shooter at Washington Navy Yard

UPDATE IV: Thirteen people are confirmed dead, including the shooter. Authorities have cleared one suspect: a white male in a tan outfit. He has been let go and is not a person of interest

Officials: Navy Yard shooter ID'ed as Aaron Alexis. #navyyardshooting http://t.co/snLJmU743J pic.twitter.com/xGUxR48gaP
— FOX 5 DC (@myfoxdc) September 16, 2013

UPDATE VIII: Officials have identified the suspect as 34-year-old Aaron Alexis from Fort Worth, Texas.

UPDATE VII: Washington DC Mayor Vincent Gray has confirmed twelve people have been killed. A motive for the shooting is still unknown.

UPDATE VI: Police are searching for two shooting suspects. One suspect is dead. The total number of shooters is believed to be three.

UPDATE V: The Associated Press is reporting six people have been killed.

Latest on Washington Navy Yard shooting: - Navy: At least 6 were killed - A shooter is dead - Police seek possible 2nd shooter
— The Associated Press (@AP) September 16, 2013

UPDATE IV: Fox News has confirmed through the Navy that there are two shooters. The Daily Caller is reporting Homeland Security does not believe the shooting has ties to terrorism.

UPDATE III: Police believe there may be more than one shooter. More from the Washington Post:

Police now believe two shooters, including one in fatigues, have killed four people and wounded eight others at the Washington Navy Yard on Monday, throwing the region into fear and chaos during the morning commute.

UPDATE II: DC police say at least ten people have been shot.

The United States Navy has confirmed there is an active shooter at Washington Navy Yard. Details at the moment are thin.

An active shooter was reported inside the Naval Sea Systems Command Headquarters building (Bldg. 197) on the Washington Navy Yard at 8:20 a.m. (Eastern Time).

There is one confirmed injury. Emergency personnel are on scene and a "shelter in place" order has been issued for Navy Yard personnel.

The Naval Sea Systems Command's headquarters is the work place for about 3,000 people.

The organization is comprised of command staff, headquarters directorates, affiliated Program Executive Offices (PEOs) and numerous field activities. Together, we engineer, build, buy and maintain ships, submarines and combat systems that meet the Fleet's current and future operational requirements.

#BREAKING: #USNavy confirms active shooter at Washington Navy Yard. More to follow.
— U.S. Navy (@USNavy) September 16, 2013

#BREAKING: #USNavy confirms 3 shots fired 820am at @NAVSEA HQs BLDG 197. More to follow. #NavyYardShooting
— U.S. Navy (@USNavy) September 16, 2013

#BREAKING: Still active shooter. More base police entering building. Approx. 3000 people work in bldg. #NavyYardShooting
— U.S. Navy (@USNavy) September 16, 2013