Schools and offices in Aurora Public Schools have been without phone and internet service since Monday morning, the district said Tuesday. Early Monday morning, employees "noticed some potential suspicious activity" within the district's network, district spokesperson Corey Christiansen said in an email to 9NEWS Tuesday. "As a precaution, we worked quickly to protect our systems, and at this time, we continue to work to bring back our systems and restore our technology infrastructure," Christiansen said. "Our teams, in collaboration with third-party experts, are working diligently to address the issue and restore services as quickly as possible." It's unclear exactly what led to the outage. Read more: https://www.9news.com/article/news/education/aurora-public-schools-internet-phone-outage/73-620fc532-9bec-46cb-88c3-b54516d51f8b ------ More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.