The suspected coordinated drone attack on the nuclear power plants Forsmark, Oskarshamn, Ringhals and the closed Barsebäck on Friday night, is now being investigated as a national special event.
At the same time, experts believe that the Swedish system is not sufficiently prepared for this type of event.
- We have not really adapted our way of looking at this type of event to today's reality.
We still think of the world as either in peace or in war, says Hans Liwång, associate professor at the Swedish National Defense College.
He thinks that more authorities than the police are involved in the investigation - hear him tell why in the clip.