Schools stayed open despite interrupted internet, email and Chromebook access; the district received an extortion demand and is still restoring systems.
City IT staff called it a cyberattack in emails, but Mayor Mike Wiza said the cause was unconfirmed. Employees also lost access to shared files and software.
A hacking group claims it accessed FBI systems. The bureau has not confirmed a breach, while its recruiting website and applicant portal have been unavailable.
Spokane Public Schools took PowerSchool, payroll and other services offline while teachers shifted to manual workarounds and an outside expert investigated.