A federal grand jury returned an 18-count superseding indictment today charging Julian P. Assange, 47, the founder of WikiLeaks, with offenses that relate to Assange’s alleged role in one of the largest compromises of classified information in the history of the United States. Assistant Attorney General for National Security John C. Demers, U.S. Attorney G. Zachary Terwilliger for the Eastern District of Virginia, Assistant Director John Brown of the FBI’s Counterintelligence Division and Acting Assistant Director in Charge Timothy Dunham of the FBI’s Washington Field Office made the announcement.