Police use water cannons to disperse students protesting against the alleged rape and murder of a trainee doctor, in Kolkata.

Police use tear gas shells to disperse students protesting against the alleged rape and murder of a trainee doctor, in Kolkata.

A water cannon being used by security personnel to disperse agitators during the 'Nabanna Abhijan' rally called by Paschim Banga Chhatra Samaj, a students' organisation, to protest against the alleged sexual assault and murder of a trainee doctor.

Tear gas shells being used by security personnel to disperse students during their protest march towards West Bengal Secretariat over the alleged sexual assault and murder of a trainee doctor, in Kolkata.

Police fire tear gas shells to disperse people protesting against the rape and murder of a resident doctor at a government hospital earlier this month, in Kolkata.

Police fire tear gas shells to disperse people protesting against the rape and murder of a resident doctor at a government hospital earlier this month, in Kolkata.

A protester lies on the road after police beat him during a rally protesting against the rape and murder of a resident doctor at a government hospital earlier this month, in Kolkata.

Protesters throw stones towards police while protesting against the rape and murder of a resident doctor at a government hospital earlier this month, in Kolkata.

Activists from school and colleges shouts slogans as they join a rally protesting against the rape and murder of a resident doctor at a government hospital earlier this month, in Kolkata.

Howrah Bridge closed in the view of a students' group's protest march to state secretariat over R G Kar Medical College and Hospital incident, in Kolkata.