The driver of the bus was killed on the spot while two others died on way to a hospital, they said.
Palia kotwali in charge Deepak Shukla said, "10 of the injured were referred to the district hospital while half a dozen others admitted to a local hospital."
The accident took place near Sharda bridge, a few km away from Palia town. The bus driver attempted to give way to a tractor-trolley coming from the opposite direction and lost control over the vehicle.
The steering of the bus was reported to have failed following which it fell into a deep ditch.
Palia Deputy SP Pradip Yadav and kotwali in charge Deepak Shukla rushed to the spot and rescued the passengers, police said.
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