Chayawut also urged the two, who are believed to be hiding somewhere in South Korea, to return to Thailand before their 90-day immigration deadline expires as their tour guide could lose its licence and face a possible ban on visiting South Korea.

The governor’s response followed the tour guide’s online post, which went viral on social media, that gave details about the two Thai women in an appeal for people to help to locate them.

The governor said an initial inquiry with the parents of one of the women, Yupin Janthasen from Nong Han, found that she had worked at a pharmacy in Muang Udon Thani before she left for South Korea on June 5. Her parents had not been informed that their daughter had gone missing from the tour, he added.

The other woman, Muang Udon Thani resident Chutima Reungpatarawet, resigned from the Protected Area Office Region 10 (Udon Thani) on June 1, and her home was closed and neighbours told officials she had gone to visit a foreign country.

Wanida said officials were worried about what had happened to the women and wanted them to return to Thailand before their visa deadline to avoid being punished under South Korean immigration law.

She also said the province had promoted a government-to-government employment scheme with South Korea, for which applicants must sit a language test to qualify for jobs. Most legal jobs were in agriculture and construction, she said.