A man in his 20s has been taken to hospital by ambulance helicopter from Märsta. A preliminary investigation into attempted murder has been initiated by the police.
The man was found outdoors and his injuries are estimated to be serious.
The location where the man was found is estimated to be the crime scene. In the search for the perpetrator, it has been tracked with a dog among other things. Several people are to be questioned. The crime scene is cordoned off and forensic technicians are to carry out a crime scene investigation.