More rioting in Greece....

They've now created a martyr...

Police fired tear gas at youths throwing rocks and firecrackers in central Athens, as several thousand demonstrators gathered to mark the death of 15-year-old Alexandros Grigoropoulos.

About 3,000 mostly students, anarchists and leftists began a march to parliament on Sunday and more protests were expected on Monday. An evening memorial service was planned in the Exarchia district, where the teenager was shot dead.

Violence also broke out in Thessaloniki, Greece's second-largest city, where youths threw petrol bombs at police and smashed the storefront of a Starbucks cafe.

More than 6,000 police were deployed across greater Athens amid fears that the demonstrations under way in the capital and other Greek cities would turn increasingly violent.

The killing of the 15-year-old last year, destroying shops, attacking public buildings and burning cars, launched rampages that went on for weeks.

Concern was heightened by reports that far-left groups and anarchists from other European countries have traveled to Greece to join the protests.