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Holiday Inn Owner, Intercontinental Hotels Group (IHG), has acknowledged a cyber-attack on the business.
IHG, which owns some of the biggest hotel chains in the world, declared in a statement that it was looking into "unauthorised access" to several of its technology systems.
In a statement from IHG, which owns some of the biggest hotel chains in the world, said it was looking into "unauthorised access" to several of its technological systems.
According to the UK-based business, "booking channels and other applications" , have been affected since Monday.
The company said: "IHG is trying to quickly complete a full system restoration."
IHG acknowledged that it was evaluating the incident's nature, scope, and effects and that it had put its response measures into action, which included hiring outside experts to look into the security breach.
"We will be supporting hotel owners and operators as part of our response to the ongoing service disruption. IHG's hotels are still able to operate and to take reservations directly.", the company said in an official statement.
But many people who have tried to make hotel reservations have complained.
IHG denied that any client data had been lost.
Although it was not explicitly stated, the majority of the speculation is that it was a ransomware attack.
More than 1,200 of the hotel chain's franchised hotels in the US were impacted by a three-month security hack in 2017.
In the context of heightened geopolitical tensions following Russia's invasion of Ukraine early this year, there is greater scrutiny on appropriate defences against cyberattacks, notably on Western financial institutions, during the time of the intrusion.