The accident took place on the Mitrapab Road after a car suddenly cut in front of the bus, which was one of three carrying the officials from Bangkok to a seminar in Khao Yai National Park in Nakhon Ratchasima.
The dead victims were Chai Chinso, 52, Somrak Pukchom-ngarm, and Supawan Pinyothammakorn, 54, who were all in the same bus.
The injured passengers were taken to the nearby Bangkok Ratchasima Hospital and Pak Chong Nana Hospital.