The leader of Spain's leftist Podemos party hailed early results from Greece's referendum showing voters decisively rejecting creditors' bailout terms as a victory for democracy.

"Today in Greece democracy won," Podemos leader Pablo Iglesias, a close ally of Greek Prime Minister Alexis Tsipras, posted on his Twitter page. "Joy is in air at Syriza headquarters," said Rafael Mayoral, another Podemos leader, who was in Greece for the referendum.