Meet the last 3 Americans detained by North Korea, who might soon be released

Kim Hak-song was arrested in May 2017 and accused of committing "hostile acts" against the state.

Prior to his detention, he worked in agricultural development at Pyongyang University of Science and Technology.

Kim is ethnically Korean but was born in China near the North Korean border. He came to the US in the 1990s, studied in California, and eventually became a US citizen. Many details about Kim, including his age, remain elusive.

Kim Sang-duk, also known as Tony Kim, was born in South Korea but became a naturalized US citizen.

Kim, 59, was detained in North Korea in April 2017 while attempting to leave the country at the airport in the North Korean capital. He was accused of "hostile criminal acts with an aim to subvert the country."

Prior to his arrest, Kim had spent a month working at Pyongyang University of Science and Technology. He taught accounting at Yanbian University of Science and Technology in China before heading to Pyongyang.

Kim had reportedly made multiple trips to North Korea in the past to do humanitarian work.