More than 500 people have been killed in various camps holding trafficked or kidnapped victims along the Thai-Malaysian borders, said a survivor wishing anonymity.
He disclosed this via an interpretor, reports The Nation.
He said: “I have also heard that thousands of Rohingya migrants were at those camps waiting for promised jobs or for ransom to arrive.”
This survivor said he was lured out of Myanmar's Rakhine state six months ago by an offer to find him a job in Malaysia but he ended up in the camp with Kazim, where between 700 and 800 migrants were held.
"My mum had to sell our family's land to pay for my ransom. That's why I am still safe," he said.
Kuramia, a migrant, paid Bt95,000 as ransom to save his nephew Kazim but he never saw him alive.
He told the police that he saw trafficker Arnua and his henchmen beat Kazim to death.
Kazim was among 26 bodies that were recently exhumed from a mass grave site in Songkhla's Sadao district.
On Sunday, Assistant National Police Commissioner General Jarumporn Suramanee said most bodies exhumed from the camp site were already skeletons and only six were decaying remains.
He said: “There were no traces of injury. So, we believe many might have died of disease or malnutrition.”
"But judging by what we could see, these bodies should belong to Asians," he said stating that it was still unclear whether the bodies were those of Rohingya.