The data breach was first revealed in December, according to Krebs on Security. Fraud experts detected a pattern of a widespread credit card breach at IHG properties, but IHG claimed in February that the breach was limited to about a dozen properties.
It was revealed this week that the breach is more widespread. Researchers found that credit card data at over 1,000 IHG properties was compromised. A full list of IHG hotel brands can be found on the IHG website; they include InterContinental, Holiday Inn, CrownePlaza and Candlewood Suites.