10 September 2011 Last updated at 16:51 ET
Greek PM vows cuts as protesters clash with police
A woman passes a fire during protests Thessaloniki, 10 September Fires were started during the protests
The Greek prime minister has vowed tough action to save the country's finances in his annual speech on the country's debt-ridden economy.
"We will push through all the major changes our country has needed for years," George Papandreou said in Greece's second city, Thessaloniki.
Public anger over cuts boiled over into clashes between police and protesters and more than 100 people were detained.
At least 20,000 people joined the protests in Thessaloniki.
Trade unionists, students, anarchists, taxi drivers and football fans were among those holding protests outside a trade fair in the city.
Greece is struggling to meet the terms of an international loan package.
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BBC News - Greek PM vows cuts as protesters clash with police