Holiday Inn owner, Intercontinental Hotels Group (IHG), has confirmed the company has been hit by a cyber-attack.
IHG, which has some of the world’s largest hotel chains, issued a statement saying it was investigating “unauthorized access” to a number of its technology systems.
The UK-based company said its “booking channels and other applications” had been disrupted since Monday.
It manages the Holiday Inn, Crowne Plaza and Regent hotels.
“IHG is working to fully restore all systems as soon as possible,” the company said.
IHG confirmed it was assessing the nature, extent and impact of the incident and had implemented its response plans, including appointing external specialists to investigate the breach.
The company is also in the process of notifying regulatory authorities.
In a statement, the company said: “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.”