Two 16-year-old boys are being held in police custody. A 14-year-old boy is also suspected of involvement. He too was taken in for questioning but was released because of his young age.
Police said they suspected that a number of people were raped but were reluctant to release any further details.
“We are dealing with very young people. We can’t say anything about what actually happened,” said police spokesman Håkan Lindholm.
The crime took place in a basement in the Möllevången district, under the Leonard shopping centre, according to Kvällsposten. The newspaper also noted that none of the alleged victims were minors.