Police is verifying documents to see if they are juvenile or not, a police officer connected with the probe told IANS.
The police did not reveal the names and age of the apprehended youths.
According to police, the crime took place around 6 p.m. on Wednesday in a park in Aman Vihar area when the two victims -- aged 17 and 18 -- were sitting there with two male friends.
"The four youth tried to whisk the women away, but when their male companions objected, the accused beat them up," the officer said.
He said that the four youth then took the young woman and the girl to a nearby isolated spot and gang-raped them.
The victims narrated the ordeal to their parents, after which a case was registered on the basis their statements.
"The medical examination confirmed rape," the officer said.
