The alarm came at 4 p.m.
Then the police received a call about an ongoing quarrel between several people on Göingegatan.
A person with a knife or stab wound was found at the scene.
It is currently unclear how seriously injured the man is.
According to the police, there is information that more people may have been injured in the riot.
The police have cordoned off an area pending the forensic scientists' crime scene investigation.
No suspect has yet been arrested.
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