‘Cybersecurity Issue’ Forces Shutdown of Computer Systems at MGM Hotels, Casinos

Computer systems owned by MGM Resorts International went down Monday after what the company described as a “cyber security issue” at its casinos and hotels.

The incident began Sunday and affected reservation systems and casino floors in Las Vegas, as well as Maryland, Massachusetts, Michigan, Mississippi, New Jersey, New York and Ohio, MGM said.

“Don’t go to @MGMResortsIntl National Harbor. Computer systems are down and it’s pandemonium here,” an apparent resort guest wrote on X.

MGM Resorts did not immediately respond to a request for comment Monday.

“MGM Resorts recently identified a cybersecurity issue affecting some of the company’s systems,” the company said in a statement, pointing to an investigation involving outside cybersecurity experts and notifications to law enforcement.

The nature of the problem was not described, but the statement said efforts to protect data involved “closing certain systems.” The websites of the Bellagio and the Aria in Las Vegas, as well as the Borgata, a casino in Atlantic City, New Jersey, and the Beau Rivage casino and hotel in Mississippi, were down Monday afternoon.

MGM said it continues to investigate what led to the attack. The company has tens of thousands of hotel rooms in Las Vegas at properties including MGM Grand, Bellagio, Cosmopolitan, Aria, New York-New York, Park MGM, Excalibur, Luxor, Mandalay Bay and Delano.

— The Associated Press contributed to this report.

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