Sub-divisional Magistrate Nawal Kishore Choudhary said that the 15 were returning to their homes at Uchika village after harvesting wheat in Sonepur riverine areas of the district.
The accident took place on Kurtha road in Shakurabad area and the dead are aged between 18 years to 32 years and have been identified.
Of the 12 injured persons, four persons have been referred to Patna Medical College and Hospital (PMCH) while the rest eight have been admitted to the sadar hospital, he said.