The man, who is in his 20s, was beaten and beaten so severely that the police consider him to be extremely serious.
The perpetrators must be in the 15-16 age group.
The young man is said to have received several blows to the head and lost consciousness during the attack.
He was taken by ambulance to hospital.
The police were later able to interrogate him at the hospital.
When the police patrol met the young man, he had several injuries.
- This was extra serious, I must say, says Thomas Agnevik, press spokesperson for the police.
Three teenagers are now suspected of extremely serious abuse.
The police have searched for them during the night but no one has been arrested.
- This young man is said to have been beaten with a fist blow and a bone iron, it is alleged from information we received initially, says Thomas Agnevik.