WASHINGTON (AP) — Police say at least 12 people have died in the shootings Monday at the Washington Navy Yard. One gunman is dead. Police now say a man who was seen in a military-style outfit and had been sought in connection with the shooting rampage has been identified and is not a suspect. The police chief says there is no indication of a possible motive at this time.

A Washington DC police officer is among the injured, and was reported in surgery.

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 Federal Aviation Administration lifted a hold on departing flights from Ronald Reagan Washington National Airport.

A gunman was armed with at least three weapons, including an assault rifle, according to local television station WJLA, which cited unidentified Washington police officials. At least four people, including a Washington police officer, were shot, the station said.

The shootings happened at about 8:20 a.m. at the headquarters of the Naval Sea Systems Command on Isaac Hull Avenue on the grounds of the historic Navy Yard.