An American teenager has been arrested by the FBI after he allegedly tried to travel to Turkey to join the Islamic State terror group, officials said.Mohammed Hamzah Khan, 19, a US citizen, was arrested at O’Hare International Airport in Chicago on October 4 before he attempted to fly to Vienna, Austria, on his way to Turkey. He was charged on Monday in a criminal complaint filed in US district court with one count of attempting to provide material support to a foreign terrorist organization. He appeared in US district court in Chicago and remains in federal custody pending a detention hearing on Thursday.