CASH machine users in Kirkby-in-Ashfield are being warned to check their accounts after a skimming device was discovered.
The scam, which resulted in people's cards being swallowed, had already been in place for two days after it was found on May 15.
The ATM affected, in Station Street, is one of the town's busiest cash points.
Some customers contacted the bank when their cards were not returned but police believe others may have been affected.
Anyone who used the cash point between Monday, May 13 and Wednesday, May 15 should check their records.
Anyone who sees anything unusual contact Notts Police on 101.
