The rally by the Nordic Resistance Movement in Goteborg featured an estimated 600 people marching in formation in all-black outfits. Some wore helmets and held shields, while others hoisted the movement's green and white flags.
Police had posted flyers before the event warning people not to act in a way reminiscent of the German Nazi's "National Socialist demonstrations in the 1930s and 1940s."
NMR, which promotes an openly anti-Semitic doctrine, originally sought to pass near a downtown synagogue during the march, which coincided with Yom Kippur, Judaism's holiest day of the year.
Counter-demonstrators threw fireworks and attempted several times to break police lines, allegedly to confront NMR members who also tried to get past riot police. Several were detained on suspicion of rioting, police said.
Police say those arrested included one person accused of kicking an officer in the face and two others for carrying knives.
Some 20 people, mostly Danes and Germans, were stopped as they arrived in Sweden to take part in the demonstration about 400 kms southwest of Stockholm.
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