The incident happened near Bengali Patti village under the jurisdiction of Sahajitpur police station. "The children were returning home after school hours when their bus came in contact with a live wire," the official said.
The live wire with which the school bus came in contact was an 11,000 volt cable that had snapped and was dangling from a pole, sub divisional officer (Sadar), Chet Narain Rai, said.
While six-year-old Aditi Kumari and five-year-old Raunak Kumar were killed on the spot, at least six other children and the driver of the bus received severe burn injuries, Mr Rai said.
While the bodies have been sent for post-mortem examination, the injured were admitted to a hospital, Mr Rai added.