Greeks Strike For 3rd Time This Year
Greek police have fired teargas at protesters outside parliament as MPs prepared to debate new austerity measures required for the EU and IMF bail-out package.
Demonstrators who broke off from a strike rally in Athens responded by throwing yoghurt and stones.
Prime Minister George Papandreou faces the risk of a revolt in his Pasok party over the austerity package.
He has proposed a unity government to pass the measures, state TV reports.
He is seeking support for a new austerity programme of 28bn euros (£24.6bn; $40.5bn) in cuts to take effect from 2012 to 2015.
Thousands are taking part in a general strike, the third in Greece this year.
Ports, public transport and banks have been badly disrupted as the main public- and private-sector unions go out on strike.
State-run companies have also joined the walkout, while hospitals are only offering emergency care. However, airports are operating normally after air traffic controllers called off their strike.
A top credit agency has cut Greece's rating, making it the least credit-worthy nation out of 131 countries it monitors.
The Greek government said the downgrade by Standard & Poor's - from B to CCC - ignored its efforts to secure funding.