Voting was postponed in 21 centers of 234 municipalities across the country following clash and rigging till 12.45pm on Wednesday.Apart from 11 candidates boycott the municipal polls. Postponed centers are-four centers in each of Jamalpur Sadar and Choumohoni of Noakhali, three centers in Chandanaish of Chittagong, two centers in each of Kalkini in Madaripur and Kalia of Narail and one center in each of Munshiganj, Robguna, Sarishabari of Jamalpur, Kuakata of Patuakhali, Barura of Comilla and Ramganj of Lazimpur.