North Korea has revealed another detainee on the same day that Korean-Canadian pastor Lim Hyun-soo was interviewed by CNN.

Kim Dong-chul, a U.S. citizen originally from South Korea said he was arrested for espionage.

Kim said he was caught collecting information for “South Korean conservative elements” in order to “destroy North Korean system.”

“I was tasked with taking photos of military secrets and ‘scandalous’ scenes,” Kim told CNN reporter Will Ripley. This included information on the “nuclear program,” Kim added.

Kim said he moved between Yanji, China and the North Korean trade city of Rason, smuggling gathered materials to China