Police are searching for a gunman who opened fire at the Washington Navy Yard this morning injuring at least one person.

According to Fox News, the shooting remains active and the U.S. Navy confirmed on Twitter they are looking for the gunman. Nearly 3,000 people who work in the Naval Sea Systems Command Headquarters building have been directed to stay in place.

Naval Sea Systems Command builds, buys and maintains the Navy's ships and submarines and their combat systems.