Holiday Inn owner Intercontinental Hotels Group (IHG) has confirmed that the business was victimized by a cyber-attack.
IHG, which is home to some of the largest hotels in the world chains, released an announcement that said it was looking into "unauthorized access" to a number of its technology systems.
The company based in the UK said that its "booking channels and other applications" were affected on Monday.
It is the manager of its hotels, including the Holiday Inn, Crowne Plaza and Regent Hotels.
"IHG is working to fully restore all systems as soon as possible," the company announced.
IHG confirmed that it was looking into the scope, severity and impact of the incident. IHG was implementing its response strategies which included appointing outside experts to examine the incident.
The company is working on notifying regulators.
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In a statement, IHG stated: "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."
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However, many who are trying to book accommodations have complained.
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IHG did not claim that there were any data breaches for customers.
The report did not claim that it was a ransomware attack, though most speculation suggests that it was.
In the last month, the Holiday Inn in Istanbul was compromised by LockBit, who released information that was stolen from the business.
It is unclear whether there is a connection with the attacks.
This hotel group was the subject of a 3-month security breach that occurred in the year 2017 in which more than 1200 Hotels that were franchised across the US were affected.
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The attack comes amid increasing attention to the right defences against cyber-attacks, especially targeted at Western financial institutions as a result of the increased geopolitical tensions after the Russian invasion of Ukraine at the beginning of the year.