Greek strike marred by violence

Thessaloniki, December 10: Protesters march as part of the general strike demonstration which paralysed Greece and piled pressure on a conservative government reeling from the worst riots in decades Photograph: Sakis Mitrolidis/AFP/Getty Images

Athens, December 10: A protester throws rocks at riot police during a demonstration outside the Greek parliament Photograph: Aris Messinis/AFP/Getty Images

Athens, December 10: A petrol bomb burns as youths clash with riot police during a demonstration outside the Greek parliament Photograph: Milos Bicanski/Getty Images

Thessaloniki, December 10: Greek police officers arrest a protester Photograph: Dimitar Dilkoff/AFP/Getty Images

Athens, December 10: Police officers stand in formation as a firebomb burns between them during clashes in front of the Greek parliament building Photograph: Oleg Popov/Reuters

A protester is detained by police during a rally Photograph: Yiorgos Karahalis/Reuters

Athens, December 10: A young protester hurls stones at riot police during a demonstration in Athens Photograph: Simela Pantzartzi/EPA

Athens, December 10: Young protesters flee tear gas outside the parliament Photograph: Louisa Gouliamaki/AFP/Getty Images

Athens, December 10: A protester smashes marble slabs with a hammer during clashes with riot police near the Greek parliament Photograph: AFP/Getty Images

Athens, December 10: A protester throws a firebomb at riot police deployed outside parliament in Athens Photograph: Louisa Gouliamaki/AFP/Getty Images

Athens, December 10: A far-right supporter, holding a knife, threatens protesters during riots outside the Athens Polytechnic Photograph: Yiorgos Karahalis/Reuters

Athens, December 10: Police arrest a protester during clashes in which protesters threw fire bombs at police outside parliament Photograph: Oleg Popov/Reuters

Thessaloniki, December 10: Elderly Greek men look at a burnt shop in the northern Greek city Photograph: Dimitar Dilkoff/AFP

Athens, December 10: Riot police walk past a barricade near the polytechnic Photograph: Milos Bicanski/Getty

Athens, December 10: A riot police officer stands outside Athens polytechnic as Greek union chiefs hailed a massive turnout of public and private sector workers for the long-planned general strike Photograph: Aris Messinis/AFP

Athens, December 10: Youngsters run to avoid tear gas thrown by riot police outside the polytechnic Photograph: Simela PantzartzI/EPA

Athens, December 11: People walk past burned cars following five days of riots in the Greek capital Photograph: Oleg Popov/Reuters