Aurora Public Schools has been plagued with a district-wide internet outage since early Monday morning, when "possible suspicious activity was detected within the network," according to a district spokesperson. During this time, the district said printer access and phone services have been limited. Security measures have also been impacted. In a statement to 9NEWS, APS public information officer Corey Christiansen said the security camera system is partially down: "While our security cameras are not fully functional, we do have camera access for critical spots in buildings," the statement reads. "Emergency response systems, secure doors, staff presence, security dispatch, campus security officers and school resource officers are all critical preventative safety measures which are currently in place." John McDonald, chief operating officer for the Council for School Safety Leadership, said based on some systems being online and some offline, it indicates the district may have multiple systems operating at once. "Sometimes there's redundancy built into systems where critical cameras are on a different system than passive cameras," McDonald said. McDonald said differences can be newer or older systems or a system is connected to a different branch. He also described critical cameras as ones that may face the front door while passive cameras may be of less value, showing the parking lot, for example. APS couldn't speak to if its critical cameras are on another network and if that's how they've maintained access to them. The district also didn't confirm how many buildings have operating cameras. APS parents have expressed concern with the district's transparency to 9NEWS over email and in interviews. They said they have questions about what the initial "suspicious activity" was, whether their children's personal information is safe and if should school continue. McDonald said he understands the worries, especially with student safety concerns at an all-time high across the country. "I think whatever your security plan is, then it's incumbent upon the district to really be robust in that action, to make sure that everybody is feeling safe in their environment," McDonald said. "And if you can respond to whatever the threat within your environment is, then you're in a good position to continue educating kids." McDonald said transparency eliminates gaps of information for families and staff, so they don't have to guess what's going on at their schools. "We don't need to necessarily shout it from the mountaintop, but we need to have communications with our parents to make sure that they understand what we're doing so they feel confident and comfortable that when they send their child to school, they're going to come home as safe and happy as when they left them with us," McDonald said. "So that's really important." McDonald spent 14 years as the executive director of school safety for Jefferson County Schools. He said he's seen security breaches at their worst and how the effects still linger. "Colorado has experienced a lot of school threats, and I think parents just have a heightened sense of making sure that they want their kids safe, and completely understandable," McDonald said. "Same time, schools have a responsibility to operate and provide a safe school environment, and part of that is making sure that kids are safe and not giving away too much information that's somebody can use that against you." APS said it expects services to be back online by Tuesday, Jan. 21. Classes Friday, Jan. 17, will, again, have a delayed start. The district said teachers and staff are using the extra time in the morning to prepare materials for the school day. "I have no doubt that they're doing the work, but sometimes we have to make sure that we're letting our community know that we're doing the work and give people the comfort, give them an understanding of what we're doing," McDonald said. "And it certainly helps you in terms of public relations. It also helps you terms of calming the noise down. And that's important is the noise can get awfully loud."