A Montgomery County police officer puts up police tape to keep people away from the scene of the  Discovery  Channel networks headquarters building in Silver Spring, Md., earlier today. Police shot and killed a man upset with the Discovery Channel network's programming who took two employees and a security officer hostage at the company's headquarters Wednesday, officials said. All three hostages escaped safely. Story here.  (AP Photo/Manuel Balce Ceneta)(AP Photo/Jacquelyn Martin)