“US citizen detained by North Korea as Japanese ships join war games” https://www.theguardian.com/world/2017/apr/23/north-korea-detains-us-citizen-japanese-ships-us-war-games
The detained American, according to Park Chan-mo, the chancellor of the Pyongyang University of Science and Technology, is Tony Kim, who also goes by his Korean name Kim Sang-duk.
Park said Kim, who is in his 50s, taught accounting at the university for about a month. He said Kim was detained by officials as he was trying to leave the country from Pyongyang’s international airport.
The Swedish embassy in Pyongyang said it was aware of a Korean-American citizen being detained recently, but could not comment further. The embassy looks after consular affairs for the US in North Korea because the two countries do not have diplomatic relations.
Park said Kim had taught at the Yanbian University of Science and Technology in China before coming to Pyongyang. He said he was informed that the detention had “nothing to do” with Kim’s work at the university but did not know further details.
As of Sunday night in Pyongyang, North Korea’s official media had not reported on the detention.
Though no details on why Kim was detained have been released, the detention comes at a time of unusually heightened tensions between the US and North Korea. Both countries have recently been trading threats of war and having another American in jail will probably up the ante even further.