Officials in Walled Lake have launched an investigation after the city's school district was hit by a cyber attack.
Supt. Kenneth Gutman confirmed the attack by hackers last night in an email to parents, where he said the attackers may have accessed credentialed information.
A team of security experts is working on the system, but officials said it could be more than a week until the full system is restored.
Virtual learning for students was not impacted, the district added.
Gutman's full statement reveals the district doesn't yet know what was impacted by the attack. He wrote: "The District has a cyber security insurance policy which provides us access to these and other experts in the field. We have also alerted authorities.
"No time has been wasted in exploring exactly what this means to our systems and data. The team of experts has been working around the clock to gain as much information as possible about this attack, as well as to determine how and when we will be able to fully restore our systems.
What we have learned is that the attackers were successful in gaining access to our system and that there is the possibility that credential and other information was available to them. Unfortunately, we do not have any specifics at this point but we will certainly keep you updated as we receive additional information.
While systems will be brought back over the course of this next week, it is not yet known when we will have access to those systems.
As communicated earlier today, Our Path and My Path virtual learning will continue, uninterrupted, for all students in WLCSD tomorrow.
This is what we know at this time. We will continue to communicate information as we know it.
We appreciate your patience and understanding as we work through this this disturbing event."