STOCKHOLM (Reuters) – Violent riots erupted in the central Swedish city of Orebro on Friday as counter-protesters attacked police ahead of a planned right-wing extremist demonstration. Police said on its website that four police cars had been set on fire and at least four police officers and one private individual had been injured as protesters threw stones and large groups attacked police cordons and tore down riot fences. The demonstration, which had received police permission, was organised by Rasmus Paludan, leader of Danish far-right political party Hard Line. Police disbanded the demonst…