The Delhi Plice, however, did not reveal the identity of the four arrested. With this, the total number of arrested went up to five.
"We would first hold a Test Identification Parade (TIP) where the victims will be called to identify the perpetrators. We would be in a position to disclose their identity only after that," a senior police official said.
Police had yesterday arrested one man identified as Prem Chand who is a resident of Kotla Mubarakpur area. Police have booked him under sections of SC/ST Act, besides various sections of Indian Penal Code (IPC) in the case after a supplementary statement by victims' male friend was filed four days later.
According to police, the two women were beaten up by a group of men who were in their late 20s.
One of the victims, who worked at a shopping mall, had gone to buy some Manipuri herbs from a shop, owned by her acquaintance from north-eastern region at around 9.30 PM on the day. When she reached the shop a youth came with a pet dog.