A chartered bus overturned in eastern Thailand early Wednesday morning, killing 18 people and injuring 31, officials said. The accident occurred in Prachinburi province during an overnight journey from northern Thailand to coastal Rayong province for a municipal study tour.

At least 18 people were killed and 23 injured in eastern Thailand on Wednesday after the brakes failed on a tour bus and it rolled upside down into a ditch, police said.

A statement by Thailand's Department of Land Transport said the bus overturned in the eastern Prachinburi province on an overnight journey from Bueng Kan in the north to coastal Rayong province for a study tour.