Why is Discovery building trending?
A gunman held hostages in the Discovery Channel building in Maryland Wednesday afternoon, Sept. 1st. He was later killed by police and no hostages were injured.
First trend: September 1 at 20:41 UTC | Last trend: September 1 at 23:40 UTC | Last defined: September 1 at 22:50 UTC | Link: http://wttrend.com/119289