The raid on Saturday came two weeks after Thailand was demoted to the lowest level in the annual US rankings of governments' anti-trafficking efforts, principally over abusive practices in the seafood industry.
Acting on a tip-off, police raided a house on a palm plantation and arrested two Myanmar men who allegedly had detained 13 Rohingya for extortion for over a month in Thailand's Chumphon province, said police Maj Gen Warawuth Thaweechaikarn. Chumphon is about 380 kilometers south of Bangkok.
Their relatives were asked to send 50,000 baht (USD 1,500) to the traffickers to bring the refugees over the border to Malaysia, he said, adding that they lived in poor conditions at the plantation and that some were physically assaulted.
"We are looking for other suspects, including Thais, who have been involved in the human trafficking network. I believe there will be more arrests to come," said Col Tikamporn Srisang of the Chumphon immigration police.
Since 2013, more than 1,700 Rohingya have been arrested in Thailand after seeing their boats run aground in the country's south.