Four U.S. citizens have been detained in North Korea. In 2015, Kim Dong Chul was arrested and is now serving 10 years on charges of espionage: spying to obtain political or military information. In 2016, Otto Warmbier, a University of Virginia student, was sentenced to 15 years of hard labor for removing a political sign.
In April, 2017, Kim Sang Duk was teaching at Pyongyang University of Science and Technology (PUST) and was detained for ‘hostile acts’. Now, North Korea has detained a 4th American, Kim Hak-song, a U.S. professor who was also working at PUST for the same ‘suspicion of hostile acts’.
The U.S. State Department released a statement saying they’re working with the Swedish Embassy but cannot release further details at this time.