North Korea arrest American professor trying to leave says he 'committed hostile acts with aim to subvert the country'

Kim Sang Duk, an American professor, was arrested at the Pyongyang airport for committing "hostile criminal acts with an aim to subvert the country" according to KCNA, the state-run news agency.
The university's chancellor, Chan-Mo Park, said the Korean-American - who is in his fifties, also goes by the name Tony Kim and Korean name Kim Sang-duk - had spent a month teaching an accounting course at the Pyongyang University of Science and Technology (PUST).

KCNA said law enforcement authorities were conducting an investigation into the crime