The student protestors, who formed a human chain from Rail Bhavan to the Rashtrapati Bhavan, have reportedly broken through the security cordon and have reached Rashtrapati Bhavan demanding justice for the victim and stronger action against those indulging in similar crimes.
Security personnel, however, managed to hold back many of the protestors at the gate.
Delhi Police detained the fifth accused in connection with the heinous incident in a late night raid on Thursday.
The police detained the fifth accused, named Raju, in Badaun, Uttar Pradesh.
Of the four men arrested earlier, one, named Mukesh, was identified yesterday by the victim's male friend who was accompanying her on the fateful night and too was beaten on his head with an iron rod several times.
The young man reportedly took a minute to identify the accused out of 11 men who were brought in front of him at Tihar Jail yesterday.
Mukesh is the brother of Ram Singh, the driver of the bus, who is also in custody.
Meanwhile, the police will today submit a status report to the Delhi High Court on the probe so far into the case.
The girl who was gang-raped and attacked with an iron rod on a moving bus in Delhi is "stable, but doctors warned of infection setting in.
"A point of concern remains her platelet count, which has fallen. I am not saying she is out of danger...but her vital parameters are within acceptable range," said Dr BD Athani, the Medical Superintendent of Safdarjung Hospital.
"The survivor girl who is battling the horrifying trauma has ''remarkable fighting spirit'', he added.
The girl has lost most of her intestine after doctors performed an elective abdominal surgery on her and removed her gangrenous small intestine.
Before her operation on Wednesday, she reportedly scribbled messages that she shared with her mother.
"Maa main jeena chahti hoon'' (Mother, I want to live)," she said.
Several politicians, including Congress president Sonia Gandhi, Lok Sabha Speaker Meira Kumar, and Sheila Dikshit have been visiting the girl at Safdarjung Hospital where she was admitted after the brutal assault.