Reports are coming in that slot machines are offline and guests are locked out of their rooms at MGM properties, including the Bellagio and Aria. Vital Vegas reported that there is a "systemwide outage at Bellagio, possibly other MGM Resorts—cash payments only at restaurants, no room charges or credit cards, digital room keys don't work."

Vital Vegas also noted a similar hacking incident in 2019, where the records of 10.7 million customers were compromised, and names, addresses, birth dates, email addresses, and phone numbers were shared on a hacker forum and later on Telegram. An ongoing class-action suit is trying to determine what is owed to those whose identities were leaked in that attack.

According to Bleeping Computer:

It appears that the outage started on Sunday night and computer systems in the resorts are currently down.

Reports online note that the company switched to manual operations as the outage credit card machines on properties have been affected.

The MGM Resorts main website is also down, currently informing that customers can make hotel reservations "at any of our destinations" over the phone.

MGM Rewards customers are also affected and they've been instructed to call a Member Services number between 6 AM and 11 PM, Pacific time.