Police Col. Bandit Muangsukham says 41 Russian passengers, along with a Thai guide and a driver, were traveling on a bus to Sai Yok district in Kanchanaburi province today.
He says the driver, who was not familiar with the route, lost control of the bus and it overturned as it came down a slope.
Bandit said a woman was killed in the crash, while 12 other tourists, including a boy, were seriously injured. Twenty others suffered minor injuries.