Initially, it was reported that 40 million credit and debit cards may have been impacted. But according to new information, the thieves also stole personal information including names, phone numbers and addresses from millions more customers.
So what should you do if you think you might be affected? Professor William Kresse from St. Xavier University is the director of the Center for the Study of Fraud and Corruption. He joins ABC7 Eyewitness News anchor Alan Krashesky with advice on what action you should take.
Plus, he explains what businesses are doing to protect their customers, and we talk about who's behind these types of crimes and what they do with the information they steal.