(Radio Iowa) – This is an unexpected day off for the 33-thousand students in Iowa’s largest school district. Officials with the Des Moines Public Schools cancelled classes for the day after what’s described as a possible cyberattack on Monday. The suspected breach forced the district to shut down its computer networks as a precaution while I-T staffers investigate what happened. Classes were called off as those networks support both online and in-person learning, though sports and activities are still scheduled.

Last year, Cedar Rapids schools were hit by a cybersecurity attack and paid an undisclosed ransom after losing a week of summer school.