A chartered van crashed head-on with a trailer truck in the northeastern province of Chaiyaphum early Monday, killing 13 people and injuring three others.
Police said the accident happened at 7am in Kaeng Khro district on the road leading to Phu Khieo district.
The accident caused the van to be engulfed with fire.
Police said 13 people, including the Thai driver, died inside the van. Three severely injured passengers were rushed to the district hospital with two transferred to Khon Kaen Hospital and another to the Chaiyaphum Hospital.
Police said 15 Vietnamese chartered the van to send them to Nong Bua Lamphu where they planned to join the celebration of an anniversary of a Catholic church.
Police said the Thai driver had yet to be identified.
The trailer truck driver, Prayuth Leesui, 35, told police that the van driver apparently fell asleep and veered to the opposite side of the road into the path of the oncoming truck. Prayuth, who was also injured, said he tried but failed to avoid the van, leading to the crash.
Police said the fire was caused by the explosion of NGV cylinders.