KOLKATA: In yet another setback for the Trinamool Congress (TMC) following its rout in the recent Bengal assembly elections, the board of Diamond Harbour municipality was dissolved on Sunday. This came after nine of the party’s councillors resigned, leading to the municipality going under administrative control.Diamond Harbour sub-divisional officer (SDO) Ayan Dattagupta has taken over as administrator of the civic body. It is the parliamentary constituency of Trinamool national general secretary Abhishek Banrejee.Eight of the nine councillors of the 16-ward municipality had sent in their resignations on May 25, while the ninth resigned on Sunday, leading to the dissolution of the board. They cited financial irregularities within the civic body, police harassment and intimidation as reasons for resigning.Administrative sources said municipal chairman Pranab Das forwarded the resignations to the state urban development and municipal affairs department, which then ordered the dissolution of the board.