About 20 Myanmar workers died and three were injured when a chartered bus caught fire while on the way to Mae Sot district of Tak province before dawn on Friday.
The warm or no air-conditioning bus was taking about 47 workers, mostly women but two men, from Myanmar to work in Nawa Nakhon industrial estate in Pathum Thani province on highway 12 (Phitsanulok – Lomsak) when there was fire inside the bus.
Initial report said 20 workers were killed as they could not escape out of the bus in time.
27 others managed to escape, three received burns.
The cause of fire was not known but initially some witnesses said a migrant worker smoked in the bus and discarded of the cigar butt on the bus floor.
The button slipped into the luggage compartment of the bus and later caught fire.
The bus was burnt to wreck with charred remains of the victims.
Bus driver said he smelled smoke as he was driving the bus near Mae Tha in Mae Sot.
He then shouted if any passenger smoked but there was no answer.
He said the double decker bus had no air-conditioning system.
Forensic police were at the scene to look into the actual cause.