It was at 20.20 on Saturday night that the police were notified of an attempted murder against a 25-year-old woman in an apartment in Hisingen, Gothenburg.
"It was in one of the detainees' apartments what happened," said Johan Jung, head of the West Police Station.
When the police arrived, they found the woman who had stabbed her back.
The woman first has a hospital.
Two men in the 30's and 50's were supposed to be in the apartment and arrested suspects in the area for attempted murder.
The apartment is locked and will be inspected over the course of the day.