A peaceful march in Athens to mark the eighth anniversary of killing of a teen by police - turned violent. Police claimed someone started throwing molotov cocktails as hundreds of demonstrators were walking through the center of the city. Officials used tear gas in return. No injuries or arrests have been reported. The fatal shooting of 15-year-old teen in 2008 -- a year before Greece's economic crisis began -- triggered the worst riots seen in the country for decades. The unrest lasted for weeks.