The fresh case comes close on the heels of a 23-year-old girl being gang-raped in a moving bus in south Delhi on December 16.
Police claimed that the woman, who hails from Jaipur [ Images ], was raped somewhere in Vrindavan and dumped in south-east Delhi's Kalkaji area on Wednesday night.
One of the accused, identified as Dilip Verma, has been detained.
The incident came to light around 9.15 pm, when a passerby saw the woman lying on a road and called the police. The victim had gone to Vrindavan on December 22 and was returning home on Wednesday.
She met Verma there and he accompanied her in a car to her hometown. On the way, Verma's two friends joined them.
"She told us that she was gagged, sedated and raped by the trio. They took turns to rape her. A medical examination has confirmed rape," a senior police official said.
The police said she was conscious and had been taken to AIIMS where she is undergoing treatment.
A case of gang-rape under section 376-G has been registered.
Delhi police spokesperson Rajan Bhagat said Verma had been picked up from Agra [ Images ] and he is being brought to Delhi for interrogation. He claimed that he knows the victim for five years.
Three police teams are currently looking for the other two accused.
A senior police official said that the woman had earlier tried to get a rape case registered in Agra but the police termed the allegations to be false and did not file any case.