citizens, who are ethnic Koreans, and six South Koreans remain in custody in North Korea. South Korea's President Moon Jae-in said on Tuesday North Korea should swiftly return South Koreans and Americans detained in the reclusive nation.Īmerican university student Otto Warmbier, who had been held prisoner in North Korea for 17 months, died at a Cincinnati hospital on Monday just days after North Korea released him from captivity in a coma, his parent said.