The four people arrested in connection to the case include Ram Singh, the driver of the private bus, and his brother. One of the two absconding were detained later.
The victim's condition, meanwhile, deteriorated on Tuesday and was put on full support.
Latest developments on the issue:
a) UPA chairperson Sonia Gandhi on Tuesday visited the rape victim at Safdarjung Hospital in New Delhi. She wrote to Delhi Chief Minister Sheila Dikshit and Union Home Minister Sushilkumar Shinde. A perturbed Gandhi has pushed for a strict punishment for rape.
b) Actors Kareena Kapoor Khan and Salman Khan spoke strongly on the issue. While the former sought a reassessment of the existing laws, the latter wanted the culprits to be strictly dealt with.
c) Angry opposition leaders on Tuesday asked the government to explain its stand on handling women's safety in an increasingly unsafe national capital. Leader of the Opposition in the Lok Sabha Sushma Swaraj sought death sentence for rapists. Samajwadi MP and actor Jaya Bachchan broke down in Rajya Sabha while speaking on the horrific incident.
d) Shinde said he would ask for the case to be put on a fast-track with daily court hearings. He said a special panel has been set up in the home ministry to set up guidelines to offer better protection for women.
e) The National Human Rights Commission (NHRC) issued notices to the Delhi Police Commissioner Neeraj Kumar and Home Secretary RK Singh and the duo have been asked to submit a report in two weeks.
f) Another man in Delhi told the police on Tuesday that barely an hour ago before the gangrape, he was travelling on the same bus and was robbed of Rs 800 by the men onboard before being made to get off near the IIT campus in south Delhi.