Of those injured, nine were in critical condition at press time.
Driver Ratchanon Intanon, 31, who did not sustain any injuries, told police that one of the tyres burst while the van was moving, which made him lose control of the vehicle. The van provided transportation services between Phitsanulok and Tak.
Ratchanon has been detained for further questioning and will face legal action if he is found guilty of reckless driving.