Polling began at 7 am on Thursday for the by-election to the Bhabanipur seat, where West Bengal Chief Minister Mamata Banerjee is contesting, and two other constituencies amid tight security and stringent COVID-19 measures. The by-polls are being held in south Kolkata's Bhabanipur, besides Jangipur and Samserganj seats in Murshidabad district and Pipili in Odisha. The results of the byelections will be declared on 3 October.