It was just before half past six on Tuesday evening that the police were alerted to the riot, which the caller described as huge.
When the police arrived at the scene, the quarrel had stopped and the people involved were dispersed.
- We meet quite soon a man in his 20s who has stab or cut injuries and an ambulance is called.
He was taken to hospital by ambulance, says Rickard Lundqvist, press spokesperson for the police.
According to an initial assessment, the man's injuries are not life-threatening.
Otherwise, the damage situation is unclear.
Police have questioned witnesses and detained people to find out if they participated in the riot or not.
Some findings have also been made at the suspected crime scene, but the police do not want to go into exactly what it is about.