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 the bodies have been sent for post-mortem examination, the injured were admitted to a hospital, Mr Rai added.
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