A Khon Kaen-Nakhon Phanom bus overturned when the driver lost control while handling a downhill curve in Kalasin's Somdet district at 5pm on Tuesday.
Three passengers were killed and 35 others injured. Police blame the accident on malfunctioning brakes and the driver’s unfamiliarity of the route.
This is the second bus accident this week. On Monday, a double-decker tour bus plunged down a 10-metre ravine in Phitsanulok killing five people and wounding 50 others.