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According to a press release by BMRCL, the sinkhole was caused due to an open well that had been closed and a building built on earlier.
The building had a chicken shop on the ground floor and a family of five living on the first floor, who have been shifted to another accommodation for safety. BMRCL said that the family will be relocated back only after the safety of the building was ensured and the tunnelling work below the building was over.
The BMRCL has decided to fill the sinkhole with sand and concrete before continuing the boring operation.