Overland Park police are warning area residents about an increase this year in the prevalence of a scam operation at gas stations.

Police in the city recently found two credit card skimming devices attached to gas pump card readers. The devices capture a credit card’s information as a person puts it into a gas pump to purchase fuel, storing the information so that the scammers can use it to make unauthorized purchases.

“If you notice someone tampering with a gas pump, please call 911,” read a release from the police. “Our best opportunity to catch those installing or removing gas pump credit card skimmers is for alert citizens to observe the activity and report it immediately.”

Moreover, if you notice unauthorized charges to your credit or debit card, contact your bank or credit card company immediately to report the fraud.

Overland Park isn’t the only area city to have been hit with the scam in recent years. A Shell station in Prairie Village was the victim of credit card skimming devices a few years back.