Groups of youth have smashed shop windows, set cars ablaze and burnt down a cultural center as the riots that started in one Stockholm suburb after a fatal police shooting spread to other low-income areas of the Swedish capital.

Police spokesman Kjell Lindgren says seven people were briefly detained early Wednesday and one person was arrested on suspicion of arson of a cultural center housed in a 19th century building.

Lindgren says 30 vehicles were set ablaze in six suburbs where mainly immigrants live. Gangs of up to 60 youths also set fire to a school and a nursery and hurled rocks at police and fire fighters.

The unrest began Sunday in response to the May 13 shooting, in which police killed a 69-year-old, knife-wielding man in a northwestern suburb.