A protest by Trinamool Congress workers and supporters out the CBI office in West Bengal's Kolkata turned ugly. The protest was sparked by the arrest of 2 serving Bengal ministers, a TMC MLA, and the former mayor of Kolkata with regard to the Narada sting case. CBI claimed that politicians were caught on cameraallegedly accepting 'illegal gratification'. TMC has called the action 'revenge' by BJP for the recent election results in which the Mamata Banerjee-led party won. Watch the full video for more.