Update, 9 pm: Police are still blocking the street. I guess they're still looking for other bombs.Update, 5 pm: The Washington Post is reporting he's been shot and the hostages freed.
2 pm: A gunman stormed the Discovery Channel HQ in Silver Spring. He reportedly fired one or more shots; took hostages; and claims to have bombs. See the "DC Area Emergency Info" tab above for links to local media sources, including live video.
Turns out this guy is James Lee, who held protests at Discovery a couple of years ago.
Here are Lee's demands:
