Posted: Sep 1, 2010 1:09 PM
Source: Associated Press
Police in Maryland say a gunman has entered the Discovery Channel headquarters in Silver Springs and has taken at least one person hostage.
Footage from WJLA-TV showed police SUVs and cruisers with their lights on.
Cpl. Dan Friz told the channel that a gunman was in the building.
Police did not immediately return calls from The Associated Press.