The cash machine network LINK has joined forces with Crimestoppers to offer rewards of up to £25,000 for information about cashpoint crime.
A suspected card-cloning device was found attached to a cash machine in Stoneycroft, Hemel Hempstead, earlier this year.
Herts police are still investigating the fraud offence, but no arrests have been made.
Graham Mott of LINK told the HeraldExpress: “We’re urging the public to come forward with any information that they may have about cash machine crime.
“Even something that may sound insignificant could be part of a bigger picture and prove invaluable in convicting someone involved.”
LINK advises avoiding any ATM which appears to have any attachments to the card slot or key pad.
The company also warns against attempting to remove such devices.
Anyone who thinks they may have been affected by cashpoint fraud should contact their bank immediately. Call Crimestoppers anonymously on 0800 555 111 with information.