The company said the intrusion ended Nov. 29, but it doesn't know how long its system in Primm, Nev., was compromised. Law enforcement was contacted Oct. 24 regarding fraudulent charges that may be linked to an unauthorized intrusion, the company said in a release.
A notice about the data breach was posted on the company's website Nov. 14.
Affinity said patrons who gambled at its 11 facilities from March 14 to Oct. 16 should monitor their financial records, place a fraud alert on their files at credit bureaus and take steps to protect their identities.
The company operates five casinos in Nevada, the Lakeside Hotel-Casino in Osceola, Iowa; St. Jo Frontier Casino in St. Joseph, Mo.; Mark Twain Casino in LaGrange, Mo.; Golden Gates Casino in Black Hawk, Colo.; Golden Gulch Casino in Black Hawk, Colo. And the Mardi Gras Casino in Black Hawk, Colo.