Kolkata, Aug. 28 -- Chaos prevailed at Trinamool Congress national general secretary Abhishek Banerjee's office on Camac Street in Kolkata on Thursday afternoon when civic body officials accompanied by a police contingent entered the premises to remove a billboard that the TMC had allegedly installed without permission. Banerjee and some TMC leaders blocked the path of the police and KMC officials as they tried to move through the human barricade. The jostling continued for around one hour. "The police acted beyond its jurisdiction. They forcefully entered my office although the billboard is placed on the roof. Our MP Derek O'Brien and several members of my office staff, including women, were injured....