Officials at MGM Resorts International properties nationwide were continuing to recover Monday from a crippling cybersecurity issue that affected credit card transactions and other computerized systems throughout its resorts.

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While the company didn’t refer to the matter as a cyberattack, there were indications Monday that MGM shut down some systems to prevent the matter from becoming worse.

The company is directing customers seeking hotel reservations to call properties directly because the online reservation system is inoperative.

“MGM Resorts recently identified a cybersecurity issue affecting some of the company’s systems,” a statement from the company — delivered from a Gmail address because company email is down — said Monday morning.