Police are hunting for a driver who fled after a car struck a motorcycle, killing all five family members riding on it, in Hua Sai district late Friday night.
The crash occurred on Khok Pikul-Bang Nop road in tambon Ban Ruam, said Pol Lt Col Chaiyawut Sriwilert, investigation chief at the Hua Sai police station, who was alerted at around 11pm.
Police, hospital staff and rescue workers who rushed to the scene found the wreckage of a Honda Jazz with Trang licence plates and a Honda motorcycle at the scene. The driver of the car had fled.
A man and three children were found dead at the scene. A woman who was badly hurt had been rushed to a hospital before police arrived.
However, she was pronounced dead shortly later. All five were from the same family, said police.
The victims were identified as Chai Chaiyaphoon, 44, his wife Khwanwipa Disthapan, 28, sons Kittisak, 4, and Theerapong, 6, and daughter Pitchaya, 9.
Officers said Mr Chai was riding the motorycle with his wife and their children riding pillion when the bike was hit by a speeding car.
The force of the crash killed Mr Chai and the three children instantly, they said.