of these developments. she joins us live from seoul, south korea. good evening to you, paula. >> reporter: good morning, christine. it's been a busy day here on the korean peninsula. we know now the identity of the american citizen, as you say, that's detained in north korea. tony kim is his name. we understand he's a professor who was teaching at the pyongyang university of science and technology. now, we had a statement from that school when they said he was detained as he was trying to do at the pyongyang airport, trying to leave the country. they say they don't believe it had anything to do with his teaching. the reason he was being investigated. they don't give an indication of why he was detained or what allegations or accusations are laid against him. we haven't heard anything official from the regime at this point. the u.s. state department says they're following this. they're dealing with the swedish embassy, as washington has no diplomatic ties with pyongyang. they go through the swedes. and the swedish embassy said he was trying to board a plane in