Detective Inspector Louise Ludwig said: "We would urge all shoppers to be wary of anyone who might be watching you at the checkout.
"Always cover your PIN when you enter it into a cash machine or Chip & PIN machine at the tills.
"Try to avoid being distracted by people asking for directions, and keep your valuables safe."
More top news
Holidaymakers have been describing the terrifying moment they were caught up in an earthquake which hit parts of Greece and Turkey.
Friday night's forecast for the west of the region
Friday night's forecast for the east of the region