SOUTH LYON, Mich. (WXYZ) — Students in South Lyon Community Schools will return to their classrooms on Thursday after a three-day closure following what officials described as a network interruption that caused security concerns.

Classes were canceled Monday, Tuesday and Wednesday as a precautionary measure.

"We were honestly in disbelief I guess because you don't really know what that means when you have a cyberattack," said Nicole Bringedahl, a parent of two children ages 6 and 8 in the district.

Parents received a letter Sunday informing them of the network outage.

WXYZ Nicole Bringedahl

During a Tuesday board meeting, Superintendent Steven Archibald explained the extent of the disruption.

"We have, currently, the inability to call in or call out of our building, which includes

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