The incident took place in Ghosh Lane locality under Town police station area late last night when Sunil Kumar, who ran a motorcycle spare parts shop, had gone to a house in his neighbourhood to attend a wedding, Deputy Superintendent of Police, Samastipur sadar, Tanveer Ahmed said.
Kumar was accompanied by his brother and two female family members at the wedding function where they received the news that their house had caught fire.
They rushed to the house in a bid to save the valuables but got engulfed by the flames, the Deputy SP said, adding, by the time the blaze was extinguished by fire brigade personnel, all the four had been charred to death.
"The fire appears to have been caused by a short circuit", the DSP added.
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