An online threat forced Naperville’s high schools to alter their regular schedules on Monday.

According to officials from Naperville Unit District 203, Indian Prairie Unit District 204 and the Naperville Police Department, an unspecified threat on Snapchat was made to one of the Naperville high schools, which was not specified.

Building access was restricted at Naperville Central and Naperville North high schools. But by 2 p.m., the police determined after-school activities could continue with an extra security presence at both schools.

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