The district said malware affected some network systems, prompting restoration work, parent questions and a review of whether student or staff information was involved.
Kentwood Public Schools said districtwide Wi-Fi issues were isolated and resolved after a student used malicious software designed to disrupt the system.
District officials said an outside actor accessed some systems, prompting a shutdown that canceled classes, child care and after-school programs Monday.
The district said it is responding to unauthorized activity on its network, but officials have not yet detailed what systems or services were disrupted.
Bellflower Unified said phone and network disruptions began in early August, followed by a months-long forensic review and a later, unconfirmed Rhysida claim.
