The raid was conducted by a police team last evening at the spa in HPT College Road locality following a tip off that a sex racket was being run from the spa, in-charge of Gangapur Road police station Mahesh Devikar said today.
Five men and eight women from the spa were detained after the raid. They were later let off after interrogation, he said.
However, owner of the spa Paresh Surana was booked under relevant sections of the Prevention of Immoral Trafficking Act, police said.