MADRID: Spanish police says they have freed a 16-year-old girl who was being advertised by an alleged prostitution ring as a virgin and have made seven arrests.

Police said Saturday that the ring was based in the southern resort town of Marbella.

The investigation was triggered by an anonymous tip sent by email to police.

The tip led police to find that the underage girl was being advertised on a prostitution website that claimed she was 18. Police say she was advertised as a virgin, with a price of 5,000 euros ($5,300).