Placards are burned at the End Austerity Now rally in Parliament Square, London. Protesters have said the march was the start of a broader campaign to end government cuts to social programs. Daniel Leal-Olivas/PA Photos/Landov hide caption

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Ada Colau (center), leader of the Barcelona en Comú party, celebrates in Barcelona during a press conference following the results in Spain's municipal and regional elections on May 24. She is the first member of Spain's indignados protest movement to win public office. Quique Garcia/AFP/Getty Images hide caption

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The leader of Greece's left-wing Syriza party Alexis Tsipras casts his ballot in Athens on Sunday. His anti-austerity party was ahead in earlier polling. Aris Messinis/Getty Images hide caption

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In Athens today, anti-austerity demonstrations began peacefully. Later, protesters threw rocks and petrol bombs. Police responded with tear gas. John Kolesidis /Reuters /Landov hide caption

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