Riot police have clashed with demonstrators in the German city of Dresden.Despite attempts to keep supporters from opposing political groups apart, two police cars were over turned and several arrests were made. February 14 is the anniversary of the Allied Forces 1945 firebombing of the city. For the last ten years, groups linked to the neo-Nazi, National Democratic Party have marked the day with marches. This year was their largest yet with 6000 taking part. But else where in the city a counter demonstration led by unions and political activists attracted more than 10,000 supporters. A heavy police presence was supposed to keep the peace but things deteriorated as some of the demonstrators sought out members of the opposing side.