Holyoke Police said the simmer was detected on Monday, 1, after a technician found the device at the Holyoke bank branch and contacted the Holyoke Police Department, reported 22News.
The Criminal Investigation Bureau is now investigating the incident.
Police say the skimmers work by reading your credit card information and pin numbers. The "collectors," then use printers to clone the cards using the thieves' names, or the info is sold on the dark web.
The department is reminding residents to always check ATMs for devices, or to see if they look strange in any way
Signs of a skimmer include if the card reader is sticking far out or if the credit card reader is loose.
Holyoke Police said to always contact the police if you find a skimmer and to alert the establishment.
You can reach the Holyoke Police Department at 413-322-6900.
Click here to follow Daily Voice Worcester and receive free news updates.