Subscribe to the BlogGerman Chancellor Angela Merkel has said Greece does not need financial aid, after talks with Prime Minister George Papandreou in Berlin.
She said Greece has not asked for financial support and that the stability of the eurozone is "assured".
Athens saw its most serious unrest since the financial crisis began, as MPs passed austerity measures.
Rock-throwing protesters outside parliament clashed with police, who used tear gas to disperse them.
The BBC's Malcolm Brabant in Athens said the mood on the streets degenerated after three months of relatively mild protests.
Trouble broke out after the leader of Greece's biggest union, Yannis Panagopoulos of the GSEE was attacked by three assailants, as he addressed demonstrators.