The three accused, who also blackmailed the girl and threatened to upload her objectionable video online if she resisted their advances, have been arrested.
The family members alleged that the girl ended her life as her complaint was not registered, a charge denied by the police, who said that the victim's kin had not given any application to lodge an FIR.
As many as 4,541 rape cases have been reported Bangladesh in the past 16 years and the accused were punished in only 60 of these incidents, according to data from the tribunals.
After fighting for her life for two weeks, she died in a Delhi hospital. The woman's family alleged that her body was "forcefully" cremated at an ungodly hour by the police.
A security guard informed a police patrolling vehicle which was just 100 meters from the incident spot. The police team rushed the victim to a hospital and later arrested all four culprits.
There is a nationwide outrage over the gang-rape and murder of the 19-year-old Dalit girl who fought grievous injuries for a fortnight before dying on September 29.
Calling for a people's movement to break "this mindset" of violence, Satyarthi said “we need both compassionate political will and people's action” to bring an end to the culture of rape.