North Korea said on Sunday it has detained another American citizen for suspicion of acts against the state, which if confirmed would make him the fourth US citizen to be held by the isolated country amid diplomatic tensions.
Kim Hak-song, who was detained on May 6, worked for the Pyongyang University of Science and Technology, the North’s KCNA news agency said.
“A relevant institution of the DPRK detained American citizen Kim Hak-song on May 6 under a law of the DPRK on suspension of his hostile acts against it,” KCNA said. DPRk is short for the Democratic People’s Republic of Korea, the North’s official name.

The Pyongyang University of Science and Technology (PUST) was founded by evangelical Christians and opened in 2010. Its students are generally children of the country’s elite.