SURROUNDED: Police detained a protester in Athens Thursday. Students marched in memory of Alexis Grigoropoulos, 15 years old, who was fatally shot by police in December 2008 amid Greek riots. (Angelos Tzortzinis/AFP/Getty Images)
SURROUNDED: Police detained a protester in Athens Thursday. Students marched in memory of Alexis Grigoropoulos, 15 years old, who was fatally shot by police in December 2008 amid Greek riots. (Angelos Tzortzinis/AFP/Getty Images)