I'm guessing you deposited money into his/her account in order to get ripped off right? Contact the bank in question, explain what happened and ask for their assistance, if they won't provide you any details (which I'm sure they won't), ask for them to release it to the police, or contact the local cops in the city and see what they can do...

Last resort ask the bank if they won't mind today tonight rocking up looking for an interview with the bank that allows dodgy people to steal money from others....

cheers

Brett