Greece Clashes

Riot police try to avoid petrol bombs thrown by youths during clashes at the northern port city of Thessaloniki, Greece, Tuesday evening Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Nikolas Giakoumidis)

Riot police detain a protester during clashes at the northern port city of Thessaloniki, Greece, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Nikolas Giakoumidis)

Riot police try to avoid petrol bombs thrown by youths during clashes outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Scores of protesting high school students hurdled rocks, and bottles during clashes clashed with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Kostas Tsironis)

Riot police pass by a burning barricade during clashes in Athens, Tuesday, Dec. 6, 2011. Scores of protesting high school students hurdled rocks, and bottles during clashes clashed with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Kostas Tsironis)

Youths chant slogans during a protest in Athens, Tuesday, Dec. 6, 2011. Scores of protesting high school students hurdled rocks, and bottles during clashes clashed with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Kostas Tsironis)

A youth prepares to throw a plank of wood from a bench against riot police during clashes outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Scores of protesting high school students hurdled rocks, and bottles during clashes clashed with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)

A petrol bomb explodes in front of riot policemen guarding the tomb of the unknown soldier in front of the Parliament during a protest in Athens, Tuesday, Dec. 6, 2011. Scores of protesting high school students hurled rocks, and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Kostas Tsironis)

Riot police officers charge protesters during a protest in the northern port city of Thessaloniki, Greece, Tuesday, Dec. 6 2011. Protesting high school students hurled rocks and bottles during clashes clashed with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Nikolas Giakoumidis)

Riot police officers detain a protester during clashes in Athens, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes clashed with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Kostas Tsironis)

Police detain a young protester during clashes in central Athens, on Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Petros Giannakouris)

Riot police detain a protester during clashes outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)

Youths throw stones as riot police run against them during clashes outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Riot police try to avoid petrol bombs thrown by youths during clashes in front of the tomb of the unknown soldier outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)

Youths throw stones at riot police during clashes in front of the tomb of the unknown soldier outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)

Riot police try to avoid petrol bombs thrown by youths during clashes in front of the tomb of the unknown soldier outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)

A youth throws a stone at riot police during clashes in front of the tomb of the unknown soldier outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Protesting high school students hurled rocks and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)

A youth throws a petrol bomb at riot police during clashes outside the Greek Parliament in Athens, Tuesday, Dec. 6, 2011. Scores of protesting high school students hurled rocks, and bottles during clashes with police Tuesday during a rally to mark the third anniversary of the fatal police shooting of a teenager in central Athens. (AP Photo/Thanassis Stavrakis)