They used a virus to encrypt all the files:
Superintendent Terry Van Zoeren said, “There’s basically no tech service happening in Swedesboro-Woolwich right now. Essentially our network has been taken over and has been made non-operational.”
“We are operating as if it’s about 1981 again,” he added.
This just goes to show how unprepared or unknowledgable many people are to deal with those on the cutting edge of technology at this point. They're bare naked ladies for the most part and I'm sorry this has happened. I'm no tech lord either but people aren't ready for the continual tech advances.