Armed Man Takes at Least One Hostage in Discovery Channel Building, May Have Bomb

DEVELOPING: Police in Maryland are responding to a hostage situation after reports that a man with a handgun entered the Discovery Channel headquarters building in Silver Spring and fired one shot.

An official with the Montgomery County Police Department confirmed to Fox News that a man with an explosive device is holding at least one person hostage in the lobby of the building.  

A Discovery employee reportedly told WJLA-TV that the building, located in suburban Washington, D.C., was on lockdown. The employee also said she thought she had heard five or six gunshots.