Five men were arrested on Tuesday night, after the victim lodged a complaint against them, police said.
"The incident had taken place twenty days back, when the girl was invited by one of the accused at his house, claiming that his mother wants to speak to her," Vishram Borkar, Superintendent of Police (North) said.
However, the girl was allegedly forced to drink some drink laced with a sedative, following which she lost consciousness and was raped, he said.
The complaint was lodged days after the incident as the school-going victim could not muster the courage to tell her parents about the incident. However, a complaint was lodged on Tuesday after she told them about the rape.
After the incident, the accused had allegedly been demanding sexual favours from the girl, by threatening to defame her.
Results of the medical examination conducted on the girl are awaited, police said.