"Remembering #Nirbhaya on the 5th anniversary of brutal Delhi incident. We cannot compensate her loss but let us resolve to keep our society safe," Banerjee wrote on Twitter.
On December 16, 2012, six people, including a juvenile, brutally assaulted and raped 23-year-old paramedic student in a moving bus in South Delhi. The victim and her male friend were later thrown off the bus. Thirteen days later, the victim succumbed to her injuries in a Singapore hospital.
The incident had triggered nation-wide protests.
The four convicts - Pawan, Vinay, Mukesh Singh and Akshay Kumar Singh - were awarded death sentence by the High Court.
The fifth accused, Ram Singh, committed suicide in jail. The juvenile accused has been released after completing mandatory probation period in a remand home.
Earlier in the day, Delhi Commission for Women Chief Swati Maliwal lamented the long-winding legal process allowed the criminals to feel they can get away with such henious crimes.
"It's the fifth death anniversary of Nirbhaya incident and the fact is that nothing has changed in this country. Everyday girls and women are being brutally raped in this country," she said.