Skimming devices have been found on Dundee cash machines over the past week, according to police.
Officers are asking residents to be vigilant after finding the devices on ATMs in Strathmartine Road and Perth Road.
Police Scotland said cardholders should check cash machines for unusual attachments before inserting cards.
A spokesman said: “Skimming devices are designed to read card details without the knowledge of the cardholder.
“Please pay close attention to see if there is anything unusual or suspicious around or on the cash machines.
“Check the card reader and the front fascia for anything that appears to be out of the ordinary before inserting your card, and check for any unusual attachments to the ATM, such as a leaflet holder.
“You should also cover the PIN key pad as you enter your number, by obscuring it with your free hand.
“If you insert your card, and it appears to be retained or jammed, check the fascia and notify the bank or service provider immediately.
“Check your account balance regularly and inform your bank immediately if your account shows any transactions you did not make.”
Anyone who finds any suspicious device or has any information regarding suspicious activity around cash machines is urged to contact Police Scotland on 101, or speak to any officer.