detained in north korea taken into custody at the pyongyang airport as he tried to leave the country. this comes as tensions rise on the korean peninsula, north korean threatening to sink a u.s. aircraft carrier in a single strike. cnn paula hancocks joins us live from seoul, south korea. good morning, good evening to you, paula. what's the latest on this u.s. citizen detained in pyongyang? >> reporter: we have a name now, dave. we understand this man is called tony kim. we believe he was teaching at the pyongyang university of science and technology. we have a statement from that school saying he was detained as he was at pyongyang airport trying to get on a plane and we understand from this statement as well they don't believe his teaching over recent weeks has anything to do with the cause of his investigation. we have no indication why he was arrested, what his allegations against him are, what the accusations are the regime are. we haven't heard officially from