Pascal Rossignol / Reuters
New Democracy supporters hold flares as they celebrate in front of the Parliament in central Athens on Sunday.
Updated at 4:49 p.m. ET: ATHENS - The pro-bailout New Democracy party came in first Sunday in Greece's national election, and its leader proposed forming a pro-euro coalition government. The result eased fears of an imminent Greek exit from Europe's joint currency.
"The Greek people voted today to stay on the European course and remain in the euro zone... there will be no more adventures, Greece's place in Europe will not be put in doubt," New Democracy leader Antonis Samaras said.
He said voters chose "policies that will bring jobs, growth, justice and security."
His party beat the anti-bailout Syriza party, which wanted to cancel Greece's international bailouts.
Yannis Behrakis / REUTERS
A Greek orthodox priest holds his ballot paper as he exits a voting booth at an Athens primary school used as a polling station on Sunday.
Syriza chief Alexis Tsipras conceded the election but vowed to continue its fight against the punishing terms of an EU/IMF bailout saving the country from bankruptcy.
"From Monday, we will continue the fight," Tsipras told supporters. "A new day for Greece has already dawned.
With 82.5 percent of the vote counted, official results showed the conservative New Democracy winning 30 percent and 130 of the 300 seats in Parliament. The radical anti-bailout Syriza party had 26.6 percent and 71 seats and the pro-bailout Socialist PASOK party came in third with 12.5 percent of the vote and 33 seats.
The anti-immigrant nationalist Golden Dawn party had 6.9 percent and 18 seats, while the Democratic left won 6.1 percent and 18 seats.
Because of a 50-seat bonus given to the party which comes first, that result would give New Democracy and PASOK 161 seats in the 300-seat parliament, in an alliance committed to a 130 billion euro ($164 billion) EU/IMF bailout keeping the country from bankruptcy.
Sunday's vote was seen as crucial for Europe and the world, since it could determine whether Greece was forced to leave the joint euro currency, a move that could have potentially catastrophic consequences for other ailing European nations and the global economy. As central banks stood ready to intervene in case of financial turmoil, Greece held its second national election in six weeks after an inconclusive ballot on May 6.
The Eurozone's finance ministers said the outcome should allow for the formation of a government that will carry the support of the electorate to bring Greece back on a path of sustainable growth.
"The Eurogroup acknowledges the considerable efforts already made by the Greek citizens and is convinced that continued fiscal and structural reforms are Greece's best guarantee to overcome the current economic and social challenges and for a more prosperous future of Greece in the euro area," the group said in a statement.
"We congratulate the Greek people on conducting their election in this difficult time," the White House said in a statement. "We hope this election will lead quickly to the formation of a new government that can make timely progress on the economic challenges facing the Greek people."
Greece has been dependent on rescue loans since May 2010, after sky-high borrowing rates left it locked out of the international markets following years of profligate spending and falsifying financial data. The spending cuts made in return have left the country mired in a fifth year of recession, with unemployment spiraling to above 22 percent and tens of thousands of businesses shutting down.
Europe may be able to muddle through but the risk is rising. "There could be a Lehman's moment if things are not properly handled," Robert Zoellick, the outgoing head of the World Bank, told Britain's Observer newspaper.
The bankruptcy of U.S. bank Lehman Brothers in September 2008 triggered a global financial slump that indebted western nations are still struggling to recover from.
'Most important election in history'
The ongoing uncertainty was a prime concern for Greek psychologist Sofia Arvanici, who spoke to NBC News at a polling station in a northern suburb of Athens.
"This is Greece's most important election in history," the 36-year-old said. "We don't know whether we will have a government tomorrow, but we can't have more instability."
The European Union and International Monetary Fund have insisted that the conditions of the 130 billion euro bailout accord agreed in March must be accepted fully by a new government or funds will be cut off, driving Greece into bankruptcy.
Opinion polls show Greeks, weary after five years of deep recession, overwhelmingly favor remaining in the euro. But there is bitter anger over the repeated rounds of tax hikes, slashed spending and sharp cuts in wages.
"I voted with a heavy heart for a pro-bailout party because I want the country to stay in the euro, with the help of our European partners. I don't think the failed recipes of the left would get us out of this mess," Stratos Economou, 49, who runs a bakery shop in Athens, told Reuters.
Zoellick and other policy makers insist that the austerity Greece is living with is preferable to the alternative.
The Observer said the Zoellick would tell a G-20 summit that the euro crisis could hit developing nations hard, although clearly the effects would be felt further afield.
"Uncertainty in markets is now starting to increase costs for developing countries," he told the newspaper. "The ripple effects are making everybody's life harder."
The G-20, which brings together finance ministers and central bank governors from 19 major economies and the European Union, will start a meeting in Mexico on Monday. The gathering in the Pacific resort of Los Cabos promised to be overshadowed by the elections in Greece and mounting worries about Spain and Italy.
During Sunday's election, voters will choose a new prime minister, but the election is also considered a proxy for a much bigger question: will Greece still use the Euro or not? CNBC's Michelle Caruso-Cabrera reports.
The fate of the euro as well as the European Union itself was top of mind for finance director Kostas Theoharis, 40, as he cast his vote near Athens.
"The main scenario is whether the euro will exist. This is the question that needs answered rather than whether Greece will be part of the euro," he told NBC News at an Athens polling station with his son Alex, 6. "I fail to see how Greece could leave the euro without breaking up Europe. I understand that this is a financial problem but it needs a political solution."
NBC News' Yuka Tachibana, msnbc.com's F. Brinley Bruton and Reuters contributed to this report.
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