
Police said the accident happened at 12.10pm at the Sa Setthi Intersection in Tambon Ban Mai.
About 100 rescuers rushed to the scene to try to save the passengers who were trapped inside the van.
The rescuers retrieved eight bodies, one of them a pregnant woman. Four were rescued and were sent to a nearby hospital.
Officials said two migrants were still missing.
Police said the van was taking the migrants back to Myanmar.