Results showed about 61 percent voted 'no,' compared with 39 percent for 'yes,' with 100 percent of the vote counted. The referendum Greece's first in more than four decades came amid severe restrictions on financial transactions in the country, imposed last week to stem a bank run that accelerated after the vote was called.

Thousands of jubilant government supporters celebrated in Syntagma Square in front of Parliament, waving Greek flags and chanting 'No, no, no'!

Early trading on Asian markets indicated investors were alarmed, as stock indexes fell.

It was a decisive victory for Prime Minister Alexis Tsipras, who had gambled the future of his 5-month-old coalition government and his country in an all-or-nothing game of brinkmanship with Greece's creditors from other European countries that use the euro currency, the International Monetary Fund and the European Central Bank.

"Today we celebrate the victory of democracy," Tsipras said in a televised address to the nation, describing Sunday as 'a bright day in the history of Europe'.

Tsipras called the referendum last weekend, saying a 'no' vote would strengthen his hand to negotiate a better deal for his country. His government has said it believes it would be possible to conclude a deal with creditors within 48 hours.

But European officials and most of Greece's Opposition parties painted the referendum as one of whether the country kept using the euro currency even though that was not the convoluted question asked on the ballot. Opinion polls Friday showed that 74 percent or more want their country to remain in the euro.

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