Kolkata: Cops have registered a case pertaining to endangering sovereignty, unity and integrity of India after they came across graffiti on a road calling for ‘armed revolution’ in the state. This is the first time that this section – covered under section 152 of BNS – has been used in an FIR in Kolkata. Police stated that they had always suspected the role of ultra left in the movement and the FIR only adds to their suspicion.tnn