
Pol Captain Pratya Pinnarat, deputy inspector of Khao Saming Police Station, said the accident happened at 3am on the Trat-bound Sukhumvit Road in front of the Khao Saming Witthaya School in Tambon Khao Saming.
Pratya said Phon Noor, 35, Chokchai, 48, and another unidentified passenger died at the scene.
The police officer said the bus left the Ekkamai bus terminal at 9pm with all seats occupied but some passengers got off in Rayong and Chanthaburi, leaving 25 passengers headed to Trat.
Survivors told police that the bus suddenly fell into the ditch and tipped over and continued to drag along the road for about 30 metres.