The police initially said a fight had broken out between several people on Tuesday. A 15-year-old boy was taken to hospital.
Two people were later arrested on suspicion of attempted murder: a 17-year-old boy and an 18-year-old man. The younger of them was also taken to hospital with serious injuries.
Prosecutor Carin Annerén Brunsson told the radio that the boys were not previously acquainted with each other.
