Vietnam's Ministry of Foreign Affairs has called in the Ministry of Public Security to investigate the disappearance of 56 Vietnamese who left a tour group to Jeju Resort Island in South Korea.
Travellers in Jeju Isand
The tour group arrived at the island on January 12 for a six-day trip, but 56 of the 155 Vietnamese left the group.
Jeju immigration officials found 28 of the missing tourists between January 13 and 16. They are believed to have used the tour as a ruse to illegally look for work in South Korea.