Two senior police officers are among hundreds of people in Edinburgh and West Lothian who have been victims of a card cloning scam.
Lothian and Borders Police and several banks are investigating the withdrawal of money from the accounts overseas.
It is believed that hand-held chip and pin card machines are being targeted by the criminals.
Police are warning retailers to watch for bogus workers who could be fitting the machines with skimming devices.
A police spokesman said although money had been coming out of people's accounts during the last two weeks, their cards would have been scanned months ago.