It was at 22 o'clock on Friday that the alarm came about a serious violent crime on Norrstrand in Karlstad.
A teenager was found severely injured shortly afterwards, and the police's extensive operation in the district continued well into Saturday.
On the night before Saturday, a person, younger than 20 years old, was first arrested on suspicion of attempted murder.
He was later arrested.
On Saturday, three more people who were detained were detained.
According to the Public Prosecutor's Office, the suspicions against all four people remain - but only one of them is still detained, reasonably suspected of attempted murder, which is the lower degree of suspicion.
- Three of them have been released, but the suspicions remain there, says Helena Ekström, press spokesperson at the Public Prosecutor's Office.
"Has used a shelter"
She is currently unable to specify which of the four suspects is the person still being arrested.
There are currently no arrest hearings planned.
The police information about the incident itself is scarce.
It has been stated that "a shelter has been used", but does not want to go into any details.
The young plaintiff in the case, a boy aged 15-18, sustained serious injuries in the incident.
On Saturday, the police stated that his condition is stable.