According to Swedish media, a large group of young people supporting the ultra-right was earlier handing out leaflets calling to "punish North Africa's children according to their deserts."
The leaflets accused migrants of assaults and harassment against Swedish women. Stockholm police confirmed that the leaflets were intended "to incite people to carry out crimes".
"There were groups of men on the streets dressed in black and wearing masks on their faces… they were beating up newcomers. I saw how they started harassing three of them," a witness told AFP.
The data contained a special secret code 291 and included 450 reports of fighting, 559 allegations of beatings, 149 reports about threats, four complaints of rape, 37 cases of suicide attempts, 58 arson reports and 96 reports of missing persons.
Earlier Sweden was said to have the largest percentage of immigrants in proportion to the local population. The country's authorities are planning to deport about 80 thousand people who do not qualify for refugee status.