Universal Health Services confirmed Monday that some of its hospitals are dealing with an ongoing, unspecified cyberattack.

“We implement extensive IT security protocols and are working diligently with our IT security partners to restore IT operations as quickly as possible,” the company said in a public statement. “In the meantime, our facilities are using their established back-up processes including offline documentation methods. Patient care continues to be delivered safely and effectively.”

Reports began circulating online early Monday morning that at least some UHS systems had been hit by a cyberattack, possibly Ryuk ransomware. UHS’ statement does not confirm that last aspect, but the reference to restoring IT operations from backups provides indication of a possible ransomware attack. Several threat intelligence analysts have lent credence to those claims, saying they have observed phishing-related attacks tied to Ryuk ransomware in recent weeks.

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