The incident took place on Thursday when the girl, a class IX student, was chatting with her friends near her house at a construction site, they said.
The accused, one of whom has been identified as Barkya, came there and drove the victim's friends away after threatening them, police said, adding after which they raped her there and left her on the spot.
She later narrated the horrifying incident to her parents when she got home after which a complaint was lodged with Kolsewadi police station under Kalyan division, they said.
Police have launched a man hunt to nab the absconding accused.
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