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The incident took place on Saturday when Amit Gupta (28), Prince Gupta (21) and one unidendified person entered the sewer tank, they said.
The three were taken out after disconnecting the power supply and rushed to a hospital where they were declared dead.
District Magistrate Shailendra Kumar has ordered a probe into the matter.
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Financial assistance will be provided to the family members of the victims as per the rules, he said.
The labourers working on the site alleged that owners of the restaurant did not follow security norms.