Pentagon locked down after shooting in Metro

A shooting at a Metro station adjacent to the Pentagon prompted the U.S. military to shut down the giant office complex on Thursday evening, officials said. According to local sources three people were shot. Two were taken to George Washington Hospital in Washington. Defense Department officials said they believed Pentagon security officers were among the injured. All entrances to the five-sided building were closed shortly after the incident.Metro is locked down until further notice, Pentagon police said in a message over the building's intercom.Some witnesses reported hearing gunshots being fired in the station and people screaming.