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

itoggle caption Aris Messinis/Getty Images

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

itoggle caption John Kolesidis /Reuters /Landov