The three men who had allegedly gang-raped the teenager at a flat in Dwarka were identified as Sahil, Vikky and Gulshan alias Babar, all in their 20s.
Following a complaint filed by the victim last evening, police have arrested the three men and Akash (18) who had allegedly molested the teenager after spiking drinks of the girls.
The girl told police that it was then that Sahil, Vikky and Babar had stepped in and rescued her from Akash and chased him away.
The trio then offered them to drop home and hired an auto, but instead took them to a flat in Dwarka in South West Delhi where they took turns to rape the victim while her female friend slept in another room unaware.
"The girl said that she could not resist their bid as she was under the effect of the drug. She has also said that she didn't knew any of the four men. We are investigating whether the other girl who was not assaulted knew any of them or not," the officer said.
"We have recorded the statement of the victim under CrPC Section 164. A case under various sections of the IPC and the Prevention of Children from Sexual Offences (POCSO) Act has been registered at Rajouri Garden police station," said Additional Commissioner of Police (West) Ranvir Singh. Further investigations are underway, Singh added.