The owner of the Holiday Inn and Crowne Plaza hotel brands has disclosed that payment card-stealing malware has struck about 1,200 of its franchisees' properties.UK-based Intercontinental Hotels Group (IHG)said all but one of the locationsaffected were in the US, with the other being in Puerto Rico.Guests have been warned they could have had money stolen as a consequence.One expert said there might be further hotels affected.