Police have fired tear gas in running battles with stone-throwing youths in Athens, where a 48-hour general strike is being held against a parliamentary vote on tough austerity measures.
Thousands of protesters have gathered outside parliament in the capital where public transport has ground to a halt.
Greece Prime Minister, George Papandreou, has said that only his 28bn-euro (£25bn) austerity plan would get Greece back on its feet.
If the package is not approved, Greece could run out of money within weeks.
Without a new plan in place, the EU and IMF say they will withhold 12bn euros of loans which Greece needs to repay debts due in mid-July.
BBC