news
Police block the street in front of the headquarters of the Discovery Channel networks in Silver Spring, Md., Wednesday Sept. 1, 2010. Police say a gunman has taken at least one person hostage in the building. (AP Photo/Jose Luis Magana)
All three hostages escaped safely.
Police spent several hours negotiating with him after he burst into the suburban Washington building about 1 p.m. waving a handgun and with canisters strapped to his body.
Montgomery County Police Chief Thomas Manger says an explosive device may have detonated, and the suspect may have brought other devices into the building. He said as far as he knows, the 1,900 people who work in the building were able to get out safely.