JACKSON, Mich. (Michigan News Source) – All public schools in Jackson and Hillsdale counties will remain closed Tuesday due to a cyberattack.

The districts closed the schools Monday, and it is unclear how long the closure will last.

The Jackson Intermediate School District (ISD) sent an email to staff and said it is a victim of a ransomware attack. Jackson ISD provides technology services for many districts in Jackson and Hillsdale counties and the attack has affected critical operating systems.

Schools are encouraging students not to use their school computers or access the school’s internet from home.