The gunman who was holding hostages in the lobby of the Discovery headquarters in Silver Spring, Maryland, was shot by police at approximately 4:50 pm, ET, police have said. The condition of the gunman, allegedly James Lee, is unknown, the police said.
He had been holding three hostages, all of whom were freed, unharmed, police said. An explosive device might have gone off when he was shot.
UPDATE: 5:29 PM, ET. CBS News is reporting that the gunman is dead.
Gunman believed be James Lee. Photo from CBS News site said likely to be James Lee in a 2008 protest: