The police received an alarm at 19.15 about a suspected violent crime.
Once at the scene, an injured person was found, but the police are tight-lipped about the extent of the damage.
Police are still working at the scene.
- We are collecting witness information and looking for a suspected perpetrator, says Daniel Wikdahl, police spokesperson.
A large area is said to be cordoned off and according to witness statements, the helicopter should have previously landed in the area.
One person describes that it is "full roll" at the place.
- There are very large police cordons, says a person on site to SVT.
The text is updated.