Police said that the pickup truck turned upside down as it plunged into the canal which was about two meters deep and filled with water. All were trapped inside and either drowned or died from the force of the violent impact.
All the victims are natives of Pa Sang district of Lamphun. They were identified as Natthapong Wongnetpa,24; Chakkrit Niamtha,24; Chesada Puangsingh,23; Thirapat Kanthiya,23; Natthapong Wisapa,22; and the driver, Sa-nguan Puangsingh,33.
Police believe that they were traveling back from a graduation party in Chiang Mai and the driver most likely fell asleep, causing him to lose control of the pickup.
The bodies have been taken to Lamphun Hospital.
The accident took place about 300 meters from Doi Dee traffic light on the Chiang Mai-Lampang highway.