Police were alerted to the scene after information that several people were arguing with baseball bats inside the market area.
– They have been beaten with baseball bats. Witnesses also mention that kicks and blows were handed out, says Kim Hild, press spokesperson for the police to Aftonbladet.
The detainees are between 17 and 65 years old.
The injured who were taken by ambulance to hospital are 17 years old.
No one has been arrested yet.