Police are investigating several cases of possible debit card fraud at a Mississippi River casino in northeast Missouri.

WGEM-TV reports that police in Quincy, Ill., have received multiple reports of fraud from customers of the Mark Twain Casino in LaGrange. Police reports reviewed by the television station show that similar complaints have been filed by customers of casinos in St. Joseph as well as Osceola, Iowa. Affinity Gaming owns all three properties.

Authorities suspect a data breach at a third-party processing center used by Affinity. Four Quincy banks reported losses totaling more than $11,000, and some of the fraudulent charges were traced to Maryland.

A statement from Affinity Gaming says the company's payment system is now "fully secured and our customers' payments are protected."