Rioters set fire to dozens of cars and threw stones at policemen in several areas of the Swedish capital Stockholm on Wednesday, the third day of urban unrest after police shot dead a man in a northern suburb. Police said eight men aged 18 to 22 had been arrested, and that 30 vehicles were torched, according to a report of DPA. Police on Sunday shot dead a 69-year-old man in the suburb of Husby, where 80 per cent of the 12,000 inhabitants are immigrants and unemployment is high. Police said they acted in self-defence after the man threatened to kill them with a knife. The riots spread to other areas.