Several people alerted the police about the loud bang at 9:20 p.m. in the evening, says Sara Andersson at the police command center.
A number of patrols, rescue services and an ambulance were called to the scene.
– Police officers on site can establish that some type of detonation took place, says Sara Andersson.
Among other things, there must be damage to the entrance and stairwell in a multi-family building.
An area around the current location has been cordoned off.
The police bomb squad has been called to the scene.
There are no reports of anyone being physically injured.
The text is updated.