Youths clash with riot police on December 7, 2008 during a massive demonstration near the main police station in Athens following the deadly police shooting of a teenager late on December 6 in the Greek capital. Andreas Grigoropoulos, 15, was shot by a police officer who opened fire after youths threw objects at his car. AFP PHOTO / ARIS MESSINIS (Photo credit should read ARIS MESSINIS/AFP/Getty Images)