A man has pleaded not guilty to federal charges that he threatened to blow up an Indiana courthouse and kill judges and police officers. Twenty-two-year-old Samuel Bradbury of Pine Village entered the plea during a federal court hearing Monday in Hammond. Bradbury is charged with threatening the use of explosive materials. Authorities say Bradbury stated in a Facebook post that he would destroy the Tippecanoe County courthouse in Lafayette and that police found ingredients for explosives in the home he shared with his parents. His attorney has said Bradbury was exercising his free speech rights and that his comments were satire. Bradbury was arrested last month and is being held without bond.