North Korea seizes 4th American for committing ‘hostile acts’

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

Kim Hak-song had worked at the Pyongyang University of Science and Technology, the same school where American Tony Kim had worked before being arrested at Pyongyang International Airport two weeks ago, North Korea’s state-run KCNA news agency said.

Few details on Kim Hak-song or his arrest were immediately available. KCNA said he was detained Saturday on suspicion of committing “hostile acts” and that a “detailed investigation into his crimes” was underway.

The U.S. State Department issued a statement saying it was aware of the detention reports.

North Korea confirmed Wednesday that it had detained Tony Kim, 55, who was seized April 22 as he tried to leave the country. Kim, who taught accounting and other courses, is accused of trying to overthrow the government.

Other Americans being held include Ohio native Otto Warmbier, 22, a University of Virginia student who was arrested in January 2016 while he was on a tour of North Korea, and Kim Dong Chul, 62, who was arrested in October 2015 while in North Korea on business. Warmbier was accused of committing a “hostile act” for allegedly trying to steal a political banner and was sentenced to 15 years hard labor. Kim was accused of stealing military secrets and is serving a 10year sentence.