MASON CITY | Mason City police confirmed officers discovered evidence of a credit card skimmer at a local credit union Monday. 

The evidence was discovered at North Iowa Community Credit Union's west branch ATM, 4063 Fourth St. S.W., Mason City, according to a news release from the police department. 

A skimmer is a device that's slid over a card reader to collect debit and credit card data. It can fit over the reader as tightly as two coffee cup lids, making it difficult to identify, Mason City Police Capt. Mike McKelvey told the Globe Gazette Tuesday. 

A week earlier, on Sept. 11, the police department responded to a report from a local resident that money was missing from her bank account.

Suspicious transactions had been occurring at locations outside of Mason City, the release said. 

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Officers determined the transactions were likely fraudulent, and that the resident had used the credit union's west branch ATM. Officials say the incident remains under investigation. 

People who may have used the west branch ATM in the past two to three weeks should continue to monitor their accounts for bogus charges, the release said. Any suspicious transactions should be reported to law enforcement. 

“MCPD is also sharing information with other law enforcement agencies that may have financial institutions who were also recently victims of similar fraud attempts,” the release said. “NICCU was a victim in this, much like its customers, and they have been very helpful in working with law enforcement to hold accountable those responsible.”

The credit union said via Facebook Monday it discovered evidence of a skimmer during a regularly scheduled inspection. 

Police found video evidence of a person “monkeying around” with the card reader, McKelvey said Tuesday. 

Anyone with information that would assist in identifying a suspect or vehicle should call the Mason City Police Department at 641-421-3636.

Tips can also be shared with the North Iowa Crime Stoppers by calling 800-383-0088.

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