Election to seven municipalities in West Bengal, including four in Darjeeling hills, is being held today with the opposition accusing the ruling-Trinamool Congress of resorting to 'strong arm tactics' and demanding a free and fair poll. Polling is being held in the seven civic bodies of Darjeeling, Kurseong, Kalimpong, Mirik Notified Area Authority in the Hills besides Domkal in Murshidabad, Pujali in South 24-Parganas, and Raiganj in North Dinajpur.