OFAC sanctions have nothing to do with Offshore Financial Centers. If I had to guess, this is more than likely a secondary list included by your service provider.
Based on the information you provided, I'm guessing the hit is in relation to a specific jurisdiction? If so, go to OFAC's website (See the link below) and read up on the specific sanction program to determine the appropriate course of action.
http://www.treasury.gov/about/organizati...ts-Control.aspxBTW, your FI should have a process in place on how to disposition screening hits.