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The state identified the attack Sunday and said authorities are investigating. Officials were unable to release technical details to protect internal systems during the investigation, the memo said.

There is no evidence that personal information was compromised, it added. Emergency services remained available.

State employees were put on administrative leave Monday. Many returned to work Tuesday, and workers will continue to come back to the office as their computer systems are brought online.

have crippled public services elsewhere in the U.S.

In 2020, for example, an took down its computer systems and website.

And in 2018 a automated 911 dispatching in Baltimore for roughly 17 hours.