SEATTLE (AP) — A 20-year-old Seattle man has pleaded not guilty to a federal charge that he tried to join the Islamic State group. Federal prosecutors say Elvin Hunter Bgorn Williams was arrested late last month at Seattle-Tacoma International Airport as he checked in for a flight to Cairo. A complaint filed in U.S. District Court said members of a Seattle-area mosque who had been trying to de-radicalize Williams were the ones who tipped off the FBI that he continued to espouse violence and extremism. A magistrate judge set trial for Aug. 9.