Dozens of windows were smashed on in a largely immigrant suburb of Stockholm on Tuesday, ten cars and several containers were set on fire, and seven police officers were injured.
Cars and containers were also set ablaze in Fittja, another of suburb of the capital.
The unrest began Sunday night in response to the May 13 shooting, in which police killed a 69-year-old man who had locked himself in an apartment in Husby, west of Stockholm. Police refused to give the nationality of the victim.
Six youths were arrested early Tuesday, but two were released after questioning, said police spokesman Jorgen Karlsson.
The atmosphere was tense on Tuesday, with residents expressing both anger at police and sadness about the destruction. City workers were seen clearing the debris of a burnt-out container and documenting fire damage.
Many local residents see the shooting as an example of police brutality, and the violence has stirred debate in Sweden.
Prosecutors have launched an internal probe into the shooting. Police say they shot the man in self-defense because he attacked them with a knife when they broke down the door to an apartment where he had locked himself up with a woman.