The Kolkata Police have registered seven cases against two BJP MLAs, a party leader and others for allegedly obstructing its personnel from performing their duties, assaulting them and causing damage to public properties during a march to the West Bengal secretariat 'Nabanna' a day ago, a senior officer said on Sunday.

BJP legislators Ashok Dinda, Agnimtra Paul and party leader Kaustav Bagchi and others have been booked under various sections of the Bharatiya Nyaya Sanhita, he said. Chaos and violent agitation dominated the streets of Kolkata and adjacent Howrah on Saturday, a day that marked the completion of one year of the rape and murder of a postgraduate trainee doctor at the state-run RG Kar hospital, and left the mother of the victim hospitalised with a head injury.

On the allegation of the mother of the deceased doctor that she was beaten up by police during Saturday's protest, Kolkata Police Commissioner Manoj Verma said, "It is part of the investigation, and we will probe into the matter. We will take action as required. The injury to the mother of the RG Kar Medical College crime victim is regrettable. This should not have happened. Whether the allegation is correct or incorrect needs to be probed."