A police patrol that was already on the pub-packed Östra Storgatan found the injured teenager, who is under 18, at around 11 p.m.
According to the police, the person had injuries caused by at least one hit and was taken to hospital.
- There has been some form of restraint, but I cannot say more for investigative technical reasons, says police spokesperson Dennis Johansson Strömberg.
A boy of the same age was later arrested on suspicion of attempted murder and later arrested by prosecutors.