The arrests took place at a residence in Muang District, Udon Thani Province, following a tip-off about illicit activities at the location, according to Immigration Bureau Chief Panumart Boonyalak, as cited by the Bangkok Post. Thai police executed a search of the property, during which they seized computers and other equipment linked to the gambling operations.
Authorities allege that the suspects were running websites such as Vinus Gaming Services and 100d-1, which are South Korean online gambling platforms that operate internationally, Thai News reported. The sites reportedly generated around ₩4 billion (US$2.79 million) in monthly revenue.
The suspects claimed they worked as IT personnel for the gambling sites, assisting gamblers in South Korea, Thailand and other countries with financial transactions.
Acting Commander Warissiri Leelasiri of immigration division 4 said the individuals had entered Thailand as tourists.
The suspects now face charges for working without proper permits as foreigners, officials said.