Clashes broke out between riot police and protestors in Athens on Thursday during demonstrations over the government's stringent austerity measures.
Officers used tear gas and stun grenades to disperse the demonstrators, who smashed bus stops and battered bank fronts with sticks and crowbars.
Some were seen burning a European Union flag.
No arrests or injuries were immediately reported.
Debt-ridden Greece detailed a whole new round of painful austerity measures, including salary cuts for civil servants, pension freezes and tax increases on cigarettes, alcohol, luxury goods and gems.
Labour unions fiercely oppose the measures.
Unions have announced further protests for Friday, when parliament is set to approve draft legislation on the new austerity plan that aims at 4.8 (b) billion euro (6.55 (b) billion US dollars) in budget savings this year.
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