North Korea has detained a US citizen identified as Kim Sang-duk, also known as Tony Kim. He worked as a lecturer and taught at Pyongyang University of Science and Technology (PUST) until he was arrested.
University officials clarified that his arrest was not linked to his work at the university.
He was arrested while he was about to leave Pyongyang.
North Korea detains another US citizen
Pyongyang has released detainees in the past
At least two other US citizens and a British journalist were detained and released by Pyongyang after 2013. They were detained for various misdemeanours and were released after a few months.
What did Tony Kim do?
North Korea is yet to disclose the reason behind Kim's arrest.
Sources said he taught at Yanbian University of Science and Technology in China, which is affiliated to PUST.
He was also involved in aid programmes in the country and had been in the country to discuss relief work.
The US did not comment on the arrest yet.
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Third US citizen in captivity
Tony Kim is the third US citizen to be detained. Before him, student Otto Warmbier was sentenced to 10 years hard labour for trying to steal a hotel sign. Kim Dong Chul, a naturalized US citizen has been sentenced to 15 years for espionage.
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He was detained at Pyongyang airport while he was attempting to board a flight to China with his wife.
He is now the third US citizen to be in North Korean custody.