Greece's parliament approved deeply unpopular austerity measures on Wednesday, despite worsening violence, in a vote vital towards securing international funds and preventing the euro zone's first sovereign default.

Amid tear gas, demonstrators hold a banner reading 'NO' during clashes with riot police in front of the Greek Parliament.

Lawmakers approved a five-year package of spending cuts, tax increases and state asset sales by a comfortable margin of 155 votes to 138 in a roll-call vote, handing a significant victory to embattled Prime Minister George Papandreou.