SOUTHBORO (CBS) — Police are warning the public after a credit card skimmer was found on an ATM at a local Cumberland Farms.

They said the device was found on a Citizens Bank ATM at the store on Turnpike Road around 9 p.m. Friday.

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A customer told the manager about the device. Southboro Police said store employees had checked the machine 36 hours before, and said there was no problem with it.

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Police advised customers who used the machine on Thursday or Friday to alert their banking or credit card companies in case of any suspicious activity.

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Investigators are still trying to find out who put the skimmer on the machine, and asked anyone with information to contact them.