MASON CITY | Police have released photos of a person they believe is involved in a card-skimming incident at a Mason City credit union's ATM. 

The suspect is described as a male with dark hair and a short beard.

“It is believed that the suspect used the information gained from the use of the skimming device to duplicate onto blank cards,” the Mason City Police Department said in a news release.

The suspect allegedly used those cards at ATMs at two convenience stores in Albert Lea on Sept. 9, police say.

The evidence of a card skimmer 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 Wednesday.

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.

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

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.

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. Any suspicious transactions should be reported to law enforcement.

Anyone with information about the incident 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.

Contact Courtney at 641-421-0534 or on Twitter @CourtneyFiorini.