The accused Melwin D'Souza (22), Sachin Yadav (22), Bipin Singh (22), Venkatesh Naidu (20) and a 16-year-old girl, who is friend of the victim, were booked for abduction and gangrape among other IPC sections, an officer at the Vakola police station said.
According to police, Melwin invited his 16-year-old female friend to his residence in Vakola's Gamdevi area for his birthday celebrations last night.
The girl took her 13-year-old friend to Melwin's house at about 7.30 pm yesterday. Melwin's three other friends Yadav, Singh and Naidu were also present in the house.
However, the victim's drink was allegedly spiked due to which she lost consciousness, after which she was allegedly gangraped, police said.
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After gaining consciousness, the victim went to her house and informed her mother about the pain in her private parts.
She was taken to a doctor, who stated that she was raped, the police said, adding that the victim along with her mother went to police station last night itself, after which all the accused were booked under relevant IPC sections.
The five were apprehended from their hideouts in the city this morning, police said.