The police received the alarm about the riot just before half past eleven.
Several patrols arrived at the scene but by then many had already left.
A man and a woman in their 20s were injured in connection with the quarrel.
However, the motive and the damage situation are unclear.
- Both were awake and talkative.
I do not know if they needed to go to hospital, says Dennis Johansson Strömberg.
The police have questioned them but do not want to go into what they have said.
The motive for the quarrel and exactly how many people were involved is unclear.
The incident has been classified as aggravated assault and assault.