Police raided the day camp in Rayong province, southeast of Bangkok, on Tuesday and took 12 children into protection, the Central Investigation Bureau said in a statement.
The 28-year-old manager has admitted charges of trafficking minors under the age of 18 for sexual exploitation and soliciting sexual services, according to the statement.
The suspect, identified as Narubet Nilthai, was arrested the same day in a sting operation at a hotel in the neighbouring Chon Buri province, the Bangkok Post reported.
Undercover officers posed as clients seeking sexual services from three boys aged 13, 15 and 16. The manager allegedly agreed to arrange the meeting for 3,000 baht (US$89) per child while taking one third of the payment as commission.

The Muay Thai camp in Rayong was training around 30 Thai and foreigners aged between 18 and 35 at the time of the raid, according to the Bangkok Post. He allegedly procured some of the young boxers for male clients.

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