The cameras were switched on for the first time on the same Friday as the school attack, because they were being tested that day, the school principal says.
The municipality had wanted to install cameras at the school for a long time, and when the permit requirement was abolished last year, the process began. Not all cameras were operational on the day of the school shooting, but they still helped police both in the emergency phase and in the investigation phase.
An 18-year-old man has been arrested on suspicion of murder and attempted murder in the school shooting that killed a 17-year-old girl and injured three teenage boys. A 16-year-old boy is also suspected of being an accessory to murder and attempted murder.
