The FBI confirmed it is investigating a potential cyberattack at multiple properties of MGM Resorts International.
A ‘cyber security issue’ impacted guest services and some of its websites remain offline, the company said.
It affected the use of digital room keys and reservation systems, and even some casino slot machines could not be played.
It impacted multiple casino hotel locations.
There were issues at MGM’s Las Vegas properties such as the Bellagio and Aria casino, as well as in Atlantic City, according to posts on social media.
It is thought to have compromised keyless entry to the nearly 4,000 guest rooms at the Bellagio.
However, most casino operations seem to be operating close to normal, albeit in ‘manual mode’ MGM said.
The FBI said it was investigating the issue.
Guests have taken to social media to vent about reservations being lost, or being unable to log in to their MGM accounts.
“We notified law enforcement and took prompt action to protect our systems and data, including shutting down certain systems,” MGM said in a statement.
It said offline services like dining and entertainment are operating normally.
No individual or group has yet admitted responsibility for the cyberattack.
In 2019, around 10 million MGM customers had their personal data exposed in a hack.
