The accused have been identified Sunil (26) and Himmat(22), DCP(Southwest) Surender Kumar said.
The woman claimed that she was brought forcefully from Gurgaon to a flat in southwest Delhi last night where the accused drugged raped her, they said.
The flat is rented by Nitin, Sunil's driver. Nitin was out of town when Himmat and Sunil allegedly took the girl there.
The incident came to light while the girl was trying to escape from the flat and fell from the window into the shaft and sustained severe injuries. While trying to prevent her from escaping, Himmat also fell from the window, police said, adding Sunil had gone out when this happened.
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The girl sustained severe back injuries and was taken to DDU Hospital from where she was referred to Safdarjung Hospital where her condition is stated to be stable, they said.
After gaining consciousness, she told police that the duo raped her after she lost consciousness upon being drugged.
The accused were arrested after the woman's medical examination was conducted, police said.
On the other hand, the accused claimed she came with them willingly and that they didn't kidnap her. They said Sunil had gone out to get some food while Himmat and the girl were drinking in the flat.
Himmat hails from Mahendragarh in Haryana and had come to Delhi around 15-20 days back to work with Sunil, whose cars were earlier plying for Uber, a police official said.