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Circle Officer Atul Sonkar said the septic tank of vegetable seller Heera Singh was being cleaned up, when gas started leaking from a chamber.
The victims were shifted to the emergency ward of the SN Medical College late in the night.
Three persons, Heera Singh and his two sons Yashpal and Hemant died. Half a dozen are still being treated.
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A few lives could have been saved had the ambulance van been equipped with oxygen, a family member said.