Police patrols are ordered to an address in Piteå where people are reported to have been injured.
People have been taken to hospital and there are individuals in custody in connection with the matter.
The circumstances are unclear, but the incident is currently being investigated as an attempted murder. This may be changed based on what the investigation shows.
Police are working with various investigative measures. The crime scene is cordoned off for technical examination, evidence is being secured, and interviews are being conducted.
Police assess that it is an isolated incident that does not pose a threat to the public.