(CNN) -- A man believed to be armed took at least one hostage Wednesday at the headquarters of the Discovery Channel in Silver Spring, Maryland, police said.
Montgomery County police received a call at about 1 p.m. of a man with a gun and possible explosives, said police spokeswoman Angela Cruz. The call came from One Discovery Place, the channel's headquarters. The area has been evacuated, Cruz said.
A SWAT team and additional resources are responding, said Montgomery County police Cpl. Dan Friz. He is in the lobby area, Friz said. Authorities were trying to get in touch with him.
CNN
