One of the "masterminds" behind cross-border trafficking is now hiding in Myanmar, according to Thai sources.

Myanmar has promised to help Thailand arrest the mastermind identified as Nuttapat Saengthong, or "Ko Mik", who holds dual citizenship. His origin, however, could not be known.  

Nuttapat is the younger brother of Suwan Saengthong, or "Ko Nui", who turned himself in to police in Thailand's Ranong province earlier.

Thai sources in Ranong bordering Myanmar said Nuttapat holding Thai-Myanmar citizenship was in Myanmar with his wife.

He is believed to be running the Rohingya trafficking business.

On May 21, Myanmar's navy rescued a group of 208 migrants on board a fishing vessel in its waters.

According to the captain and crew of the vessel, Nuttapat was the owner and ringleader.

Later, Myanmar authorities ordered his arrest and started working with Thai authorities to crack down on human trafficking rings.

Thai officials have identified 10 people allegedly involved in the smuggling ring led by Nuttapat.

They have reportedly uncovered evidence showing a money trail in which properties and other assets were transferred and cross-owned by various family members who are unusually rich.

Apart from Nuttapat, another five suspects are believed to have slipped into Myanmar and they are hiding there now.

[With report from The Nation]