The victims have been identified as Dulari Devi (50), her grand-daughter Savitri Kumari (6) and infant twins Palak and Krishna, the police said.
District Deputy Commissioner Amit Kumar said the building was in a dilapidated condition and the roof of the house suddenly caved in causing the casualties.
Following the incident, he said local residents rushed them to the nearby government hospital, but all of them succumbed to their injuries.
A detail report has been sought in this regard from the Sub-Divisional Officer concerned, Kumar added.
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