The mishap happened at around 3.15 PM when the bus, travelling from Mohanpur to Sabang, fell into a ditch on the roadside, West Midnapore Superintendent of Police Alok Rajoria told PTI.
The SP said the mishap took place when the driver tried to save a motorcycle that suddenly came in front of the bus.
"Six persons have died in the accident. And as per our information at least 25 others are treated at a nearby hospital," Rajoria said.