Senior officer Mahesh Patil told The Times of India newspaper that the individuals were fined 1200 rupees ($24) each after a raid on a nightclub in the northern suburb of Malad on Saturday night.
"Ten of the 31 offenders were girls. They were dancing vulgarly in the converted disco, which is considered to be a public place," he was quoted as saying, without elaborating. The raid, in which 77 people - including diners - were detained altogether, was initially for playing music without a licence, but police decided to act after finding the dancing "objectionable", the daily added.