Thai police said Saturday that 28 Russian tourists were injured after bus they were riding on crashed into a small hill near a popular tourist site.

Police Col. Bandit Muangsukham said that 44 Russian passengers, along with three crew members, were traveling to a cave in Kanchanaburi province on Friday when the accident happened.

He said the driver told police he suddenly lost control of the steering wheel before the bus veered into a small hill and flipped onto its side.

He said 25 passengers were slightly injured and three suffered serious injuries.

The bus was traveling from Pattaya, a seaside town in eastern Thailand, on the way to Krasae cave in Kanchanaburi, 180 kilometers (110 miles) west of Bangkok, at the time of the accident.