The municipality has also hired external experts to investigate what happened.
Currently, services for residents and employees are not affected.
According to a press release, the municipality's crisis management is also activated.
- In the municipality of Norrköping, we have carried out several initiatives over the years to strengthen our IT security and our routines.
This means that we are prepared for different scenarios should it happen that we end up in a difficult situation, says Anna Selander, acting municipal director, in a statement.
(The text is updated)