Two of the accused, including prime accused Kader Sk, were still absconding, police sources said.
Three of the accused, Sumit Bajaj, Nasser Ali and Ruhman Khan arrested on February 18 were sent to judicial custody after their police remand ended on March 3.
The 37-year-old woman, a mother of two, had lodged an FIR with the Park Street police station on February nine that she was raped in a car when she was returning from a night club on Park Street four days earlier.
She alleged that she was threatened at gun-point and was later thrown out of the car.
Joint Commissioner of Police (Crime) Damayanti Sen, who punctured Chief Minister Mamata Banerjee's claims and cracked the case, was on April four transferred to a relatively low-profile posting.
