Most Dangerous Day Ever In Washington DC?

Biden tells his staff to clear out of Washington before Monday's inauguration, Many notable democrats, are "skipping" President Trump's inauguration. Rumors of Drones being used to detect nuclear material. 5000 troops augment security and the FBI and Secret Service tell us January 20th will be incredibly dangerous in Washington DC. Could someone be plotting to set off a dirty nuke in the city? Could they be planning something big in other cities?