Repolling began at 15 booths in South 24 Parganas after reports of electoral malpractices in Magrahat Paschim and Diamond Harbour.
The Election Commission ordered fresh voting based on reports from observers and “material circumstances”, with polling from 7 am to 6 pm.
BJP alleged irregularities in seats linked to Abhishek Banerjee; counting for the state polls is scheduled on May 4.