New Delhi, Aug. 22 -- A man was killed and three others injured after a dilapidated two-storey building undergoing demolition collapsed in Karol Bagh on Friday, police said, adding that the contractor for the project has been arrested. Police said the labourers got trapped at the site. No permission for the demolition had been obtained from the concerned agency, DCP Rohit Rajbir Singh said. P4

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