Superintendent of Police Pankaj Raj said that the deceased have been identified as Puja Devi (25) and her two children Nikhil Kumar (03) and Naitik Kumar (02).
The Deceased's husband Navin Singh works outside Bihar.
Prima facie, it appears that her in-laws have killed the woman whereas her in-laws said that they died due to electrocution late last night, SP said.
The deceased's mother-in-law has been arrested in this connection while other members of the family are absconding since the incident, he said.
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The deceased's mother Rekha Devi has lodged a named FIR against three persons of the family with Amnaur police station.
She has alleged in the FIR that in-laws used to inflict torture on her daughter for dowry.
Rekha Devi said that her daughter told her relatives that her in-laws are demanding Rs 5 lakh when they (relatives) had gone to bring her back to her maternal house few days back.