DES MOINES, Iowa (AP) – Iowa’s largest school district has canceled classes for Tuesday after determining there had been a cyber attack on its technology network.

Des Moines Public Schools announced Monday that Tuesday classes would be canceled for its 33,000 students after being “alerted to a cyber security incident on its technology network.” The district said in a news release that it took its internet and network services offline while it assessed the situation.

It didn’t describe the nature of the attack or say whether sensitive information might have been stolen.

It also didn’t immediately respond to Associated Press requests for further information.

The district will decide Tuesday afternoon whether to hold classes Wednesday.

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