North Korean officials have reportedly detained an American teacher working at the Pyongyang University of Science and Technology.

North Korea announced Sunday that it detained another American over the weekend, raising to four the number of U.S. citizens being held by the communist nation’s authoritarian regime.


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Here’s a look at prominent detentions of foreigners by North Korea in recent years:

— Kim Hak Song was detained Saturday to be investigated for committing unspecified hostile acts, North Korea has said. He worked in agriculture development at an experimental farm at the Pyongyang University of Science and Technology.

— Tony Kim, who also goes by his Korean name Kim Sang-duk, was detained April 22 at the Pyongyang airport. He taught accounting at the Pyongyang University of Science and Technology. He was accused of committing unspecified criminal acts intended to overthrow the government.

— South Korean-born U.S. citizen Kim Dong Chul was sentenced in April 2016 to 10 years in prison with hard labor after being convicted of espionage. He told CNN he was president of a trade and hotel services company in Rason, North Korea.

— American tourist Otto Warmbier was sentenced in March 2016 to 15 years in prison with hard labor for subversion. The University of Virginia undergraduate said he tried to steal a propaganda banner as a trophy for an acquaintance who wanted to hang it in her church.

— Hyeon Soo Lim, pastor of a Toronto church, was sentenced in December 2015 to life in prison for harming the dignity of North Korea’s leadership and trying to use religion to destroy its system. Supporters have said Lim was on a humanitarian trip when he was detained.

— Won Moon Joo, a South Korean…