(ABC NEWS) -- Four are dead and two law enforcement officers are among the injured after an armed suspect allegedly fired shots inside the Navy Sea Systems Command headquarters building in Washington, D.C., this morning.
Law enforcement sources tell ABC News that the situation is still fluid and police are still working to clear the scene.
The suspect is being described as a thin, bald, male and is carrying an assault weapon, according to law enforcement sources.
The incident occurred in a 3,000-person building at 8:20 a.m. Law enforcement officials initially told personnel to evacuate the building but they are now being told to shelter in place.
The White House said that President Obama was briefed this morning about the ongoing situation.
Planes have resumed flying out of nearby Reagan National Airport after a ground stop was imposed by the FAA due to the ongoing situation at Navy Yard earlier this morning, a Metropolitan Washington Airports Authority spokeswoman tells ABC News.
The Naval Sea Systems Command, the largest of the Navy's five commands, is responsible for engineering, building, buying and maintaining ships, submarines and combat systems in the Navy's fleet.