Four others were injured, police said.
The victims were on their way to Kondagaon in Chhattisgarh from Varanasi when the accident took place, said Jaisinghnagar police station in-charge, Shesh Mani Patel.
Nine people, all members of a family, were killed in the accident, he said.
Police were yet to identify them as the injured persons hadn't regained consciousness, he added.
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