The fire was suspected to have been caused by calcium carbide, a combustible material used for artificial ripening of fruits, carried by a passenger on the bus, police said.
The bus was on way to Sheikhpura from Patna when it caught fire at 6 pm near Vishkarma temple at Harnaut Bazar, 50 km from the state capital, Superintendent of Police Kumar Ashish said.
The entire bus was engulfed in flames, he said.
District Magistrate Thiagrajan S M said the dead comprised seven adults and a child.
Traces of calcium carbide have been found on the spot, the DM said.
Chief Minister Nitish Kumar has expressed profound grief over the incident and announced Rs four lakh ex-gratia each for the families of the deceased.
The chief minister also issued direction to provide free medical treatment to the injured.
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