Greece voted Sunday amid global fears that victory by parties that have vowed to cancel the country's international bailout agreements and accompanying austerity measures could undermine the European Union's joint currency and pitch the world's major economies into another sharp downturn.

For Greeks, it is the second national election in six weeks and arguably the most critical in decades, reflecting political turmoil sparked by a two-year financial crisis that some fear could force the country to abandon the euro and return to its old currency, the drachma. That in turn would likely drag down other financially troubled countries and threaten the euro itself.

The last opinion polls published before a two-week pre-election ban showed the radical left Syriza party of Alexis Tsipras running neck-and-neck with the conservative New Democracy party of Antonis Samaras. But no party is likely to win enough votes to form a government on its own, meaning a coalition will have to be formed to avoid yet another election.

The results of exit surveys were expected at the close of polling stations at 7 p.m. (1600 GMT) Sunday, and the first official projections were expected at around 9:30 p.m. (1830 GMT). Strong winds in the Greek archipelago forced the cancellation of some ferry routes, raising doubts about whether some voters would be able to get to islands with polling stations in time.

Inconclusive elections on May 6 resulted in no party winning enough votes to form a government, and coalition talks collapsed after 10 days. The vote, which also sent the formerly governing socialist PASOK party plunging to historic lows, sent a very clear message that Greeks have lost patience with the deep austerity imposed in return for the country receiving billions of euros (dollars) in rescue loans from other eurozone countries and the International Monetary Fund.

"I'd like to see something change for the country in general, including regarding the bailout," said Vassilis Stergiou, an early-morning voter at an Athens polling station. "But at least for us to get organized and at the very least do something."

Bailout agreements

Tsipras, a 37-year-old former student activist, has vowed to rip up Greece's bailout agreements and repeal the austerity measures, which have included deep spending cuts on everything from health care to education and infrastructure, as well as tax hikes and reductions of salaries and pensions.

But his pledges, which include canceling planned privatizations, nationalizing banks and rolling back cuts to minimum wages and pensions, have horrified European leaders, as well as many Greeks. Tsipras' opponents argue that the inexperienced young politician is out of touch with reality, and that his policies will force the country out of the euro and lead to poverty for years to come.

Virtually unknown outside of Greece four months ago, Tsipras' pledges and his party's strong showing in the May 6 elections, where he came a surprise second place and quadrupled his support since the 2009 election, has put him in the international spotlight.

Scores of journalists and television news crews from across the world jostled for space to cover Tsipras casting his ballot in an Athens polling center.

"We have beaten fear. Today we open a road to hope," he said after voting, adding that he was confident of victory.

"Today we open a road to a better tomorrow, with our people united, dignified and proud. In a Greece of social justice and prosperity, an equal member of a Europe that is changing. A Europe of the peoples and of solidarity."

Joint currency or the drachma

The young left-wing leader has accused his rivals of attempting to terrorize the population by casting him as the man who will ruin the country, and insists he will keep Greece within the euro — something that repeated opinion polls have shown about 80 percent of Greeks want.

Greece has been dependent on the 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.

For his part, Samaras has cast Sunday's choice as one between the euro and returning to the country's old currency, the drachma. Although he voted against Greece's first bailout in 2010, when his party was in opposition, he backed the second bailout agreed on late last year.

He has vowed to renegotiate some of the terms of the accompanying austerity, but insists the top priority is for the country to remain in Europe's joint currency.

"The main thing we will decide on is the dilemma, euro or drachma," he said during his final pre-election rally in central Athens on Friday.

European leaders warn Greece

European leaders have cautioned that Greece could be left outside the 17-nation eurozone if it pulls out of its bailout commitments.

Newly elected French President Francois Hollande warned in a Greek television interview earlier this week that "if the impression is given that the Greeks want to move away from the commitments that were taken and abandon all prospects of revival, then there will be countries in the Eurozone that will want to end the presence of Greece in the eurozone."

Nearly 10 million people are eligible to vote in the country of about 11 million people. Polls close at 7pm (1600 GMT), with official results expected a few hours later.

"Today the Greek people speak. Tomorrow a new era for Greece begins," Samaras said after casting his ballot in a small town in southern Greece, the first of the main politicians to do so.

As Greeks went to the polls, more than 250 firefighters and soldiers battled a fire raging south of the Greek capital since Saturday afternoon. Local authorities said several houses were burned. Gale-force winds were hampering the efforts to extinguish the blaze, and Greece asked for help in water-dropping planes from Italy, France and Croatia.

Three firefighters suffered burns on Saturday, while four people were arrested for allegedly starting the fire by accident during welding work at a construction site.