Radisson did not specify how many hotels or customers were affected but advised that all guests review their account statements and report unauthorized purchases to the bank that issued the credit card, as well as law enforcement authorities.
David Chamberlin, a spokesman for Radisson, said the company is unable to provide accurate estimates of the number of potentially exposed records at this time because the investigation is still ongoing. Chamberlin said the company will provide updates as more information becomes available.
The computers were accessed between last November and May.
"Working with law enforcement and forensic investigators, we are conducting a thorough review of the potentially affected computer systems and have implemented additional security measures designed to prevent a recurrence of such an attack and to protect guest privacy," said Fredrik Korallus, executive vice president and chief operating officer.
Radisson, which operates more than 400 hotels in 68 countries, is based in Minneapolis.
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