The deceased were identified as Sangdeun Saraboon, 24, Manit Momkunthod, 27, and Ariya Plakpromrad, 25.
The van driver, Chalermsak Mooksidaeng, 33, said that he was rushing to drop the seven passengers in Sikhiu and Pak Chong districts at around 6am when he attempted to pass a truck on a sharp curve and almost hit a pickup truck. He swerved to avoid the pickup but lost control of the van, crashed into trees at the side of the road and overturned.
Police and paramedics sent the injured to local hospitals. At least one of the victims, believed to severe injuries, has been transferred to Nakhon Ratchasima Hospital. The police detained Chalermsak, who will be charged with reckless driving causing death and bodily harm.