The government identified the 'commercial facilities sector,' which includes gaming and lodging, as critical infrastructure in 2003. The scope of the government response, beyond the FBI involvement, was not immediately clear. The information was exfiltrated in the summer of 2019, the company said at the time. In 2020, the personal details of more than 10 million MGM visitors were published on a hacking forum.

The company has had cybersecurity incidents in the past. It wasn't immediately clear when the outage started, although some users on social media reported that MGM's systems were down as early as Sunday night. MGM's website has been replaced by a landing page advising that patrons contact their hotels or casinos directly via phone. MGM shares closed down nearly 2.4% on Monday. The FBI confirmed that it was aware of the 'ongoing' incident but did not provide further information.

'We also notified law enforcement and took prompt action to protect our systems and data, including shutting down certain systems.' 'We quickly began an investigation with assistance from leading external cybersecurity experts,' MGM said in a post on X, formerly known as Twitter. The company reported Las Vegas rooms revenue of $706.7 million for the quarter ended June 30, compared to casino revenue of $492.2 million for the same period. Revenue from their hotel rooms in Las Vegas outstrips the revenue directly attributed to their casino operations, according to SEC filings. MGM operates thousands of hotel rooms across Las Vegas and the United States.

But the reservation systems that power their thousands of hotel rooms and the booking system that controls reservations for their restaurants are apparently still down, more than a day after the first reports of the incident began to circulate. The company said that as of Monday evening, their casino floors were back online. The company's email systems were also apparently taken down in response to the cybersecurity issue, and have not yet come back online. Personal Loans for 670 Credit Score or Lower Personal Loans for 580 Credit Score or Lower Best Debt Consolidation Loans for Bad Credit

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