Swedish police say rioters in several suburban districts of Stockholm have burned two schools and 15 cars in the fifth straight night of unrest.

Police spokesman Kjell Lindgren says 13 people, aged between 18 and 25, were detained in connection with the disturbances which included an unsuccessful attempt to damage a police station.

Lindgren said Friday that the overnight violence was less intense than previous nights and that the participants seemed less aggressive.

The unrest in the Stockholm suburbs, some of which are predominantly populated by immigrants, was sparked over perceived police brutality after officers shot and killed a knife-wielding man who had locked himself in his apartment.