Two more persons have been arrested in connection with the gang rape of a 23-year-old student here, who remained on ventilator in a critical condition. With the two arrests, the total number of persons arrested in this case has climbed to four. Two persons were arrested yesterday.

The incident triggered outrage with students of Jawaharlal Nehru University staging a demonstration outside Vasant Kunj Police Station.

The 23-year-old para-medical student was raped and brutally assaulted by four men who also attacked her male friend and threw both of them out of the vehicle.

Last night, Ram Singh, the driver of the bus in which the girl was raped, and his brother Yogesh were arrested. Singh and Yogesh are the first to be arrested, police said and added that Yogesh was driving the bus when Singh allegedly raped the girl along with others.

The condition of the girl remained critical and she was on ventilator in Safdarjung Hospital.

Both the girl and her male friend, who had boarded the chartered bus with tinted glass windows from Munirka in south Delhi around 9.45 P.M. to Palam, were assaulted with an iron rod by the men after the two resisted before they were dumped on the road side near Mahipalpur flyover, police said.

Sources said police managed to get the CCTV footage of the bus from which they managed to zero in on the bus. The investigators also send text messages to mobile phones of the victims which were snatched by the attackers.

“One of the phones was active and it helped us to pinpoint on them,” a senior police official said.

Police have recovered the iron rod which was used to assault the victim and her male friend, the official said.