Eurozone finance ministers were set to weigh Greece's latest proposal for aid Wednesday, hours after the country's international bailout expired without a deal, cutting it off from vital financing and deepening fears over whether it will be able to remain in the eurozone.

With its failure to repay the roughly 1.6 billion euros ($1.8 billion) to the IMF, Greece became the first developed country to fall into arrears on payments to the fund. The last country to do so was Zimbabwe in 2001.

Wednesday's teleconference of eurozone finance ministers was to take place after the ministers said late Tuesday there was no way they could reach a deal to extend the bailout for Greece before the midnight deadline.

"It would be crazy to extend the program," Dutch Finance Minister Jeroen Dijsselbloem, who heads the eurozone finance ministers' body known as the eurogroup, said late Tuesday. "So that cannot happen and will not happen."

As Greece's leaders pushed new terms for a possible third bailout, they also struggled to cope with the consequences of shutting banks and the stock market this week.

Authorities and citizens alike braced for long lines as a thousand bank branches around the country were ordered to reopen Wednesday to help desperate pensioners without ATM cards cash up to 120 euros ($134) from their retirement checks. The elderly have been hit particularly hard, with tens of thousands of pensions unpaid as of Tuesday afternoon.

The expiration of the international bailout followed a tense weekend during which Prime Minister Alexis Tsipras announced he would put a deal proposal by Greece's international creditors to a referendum on Sunday and urged a "No" vote.

The move increased fears the country could soon fall out of the euro currency bloc and Greeks rushed to pull money out of ATMs, leading the government to shutter its banks Monday and impose restrictions on banking transactions for at least a week. Greeks are now limited to ATM withdrawals of 60 euros ($67) a day and cannot send money abroad or make international payments without special permission.

But in a surprise move late Tuesday, Deputy Prime Minister Yannis Dragasakis hinted that the government might be open to calling off the popular vote, saying it was a political decision.

The government decided on the referendum, he said on state television, "and it can make a decision on something else." It was unclear, however, how that would be possible as Parliament has already voted for the referendum to go ahead.

With its economy teetering on the brink, Greece suffered its second sovereign downgrade in as many days Tuesday when the Fitch ratings agency lowered it further into junk status, to just one notch above the level where it considers default inevitable.

The agency said the breakdown of negotiations "has significantly increased the risk that Greece will not be able to honor its debt obligations in the coming months, including bonds held by the private sector."

Fitch said it now considered a default on privately-held debt "probable."

Greece's financial crisis has reached a critical stage after the left-wing-led Greek government, elected in January on a promise to bring an end to the hated austerity measures that it blames for an acute economic recession, failed to agree on a package of spending cuts and reforms demanded by creditors in exchange for access to the remaining 7.2 billion euros ($8.1 billion) in rescue loans.

Hopes for an 11th-hour deal were raised when the Greek side announced it had submitted a new proposal Tuesday afternoon, and the eurozone's 19 finance ministers held a teleconference to discuss it.

But those hopes were quickly dashed.

German Chancellor Angela Merkel said she ruled out further negotiations with Greece before Sunday's popular vote on whether to accept creditors' demands for budget reforms.

"Before the planned referendum is carried out, we will not negotiate over anything new," the dpa news agency quoted Merkel as saying.

Greece's latest offer involved a proposal to tap Europe's bailout fund — the so-called European Stability Mechanism, a pot of money set up after Greece's rescue programs to help countries in need.

Tsipras' office said the proposal was "for the full coverage of (Greece's) financing needs with the simultaneous restructuring of the debt." It did not provide details.

Dijsselbloem said the finance ministers would "study that request as we should" and that they would hold another conference call Wednesday.

Dragasakis, the Greek deputy prime minister, said the country's new proposal "narrows the differences further."

"We are making an additional effort," he said. "There are six points where this effort can be made. I don't want to get into specifics. But it includes pensions and labor issues."

European officials and Greek opposition parties have been adamant that a "No" vote on Sunday will mean Greece will leave the euro and possibly even the EU.

The government says this is scaremongering, and that a rejection of creditor demands will mean the country is in a better negotiating position.

In Athens, more than 10,000 "Yes" vote supporters gathered outside parliament despite a thunderstorm, chanting "Europe! Europe!"

Most huddled under umbrellas, including Athens resident Sofia Matthaiou.

"I don't know if we'll get a deal. But we have to press them to see reason," she said, referring to the government. "The creditors need to water down their positions too."

The protest came a day after thousands of government supporters advocating a "No" vote held a similar demonstration.

On Monday, European Commission President Jean-Claude Juncker made a new offer to Greece. Under that proposal, Tsipras would need to accept the creditors' proposal that was on the table last weekend. He would also have to change his position on Sunday's referendum.

Commission spokesman Margaritis Schinas said the offer would also involve unspecified discussions on Athens's massive debt load of over 300 billion euros, or around 180 percent of GDP. The Greek side has long called for debt relief, saying its mountainous debt is unsustainable.

A Greek government official said Tsipras had spoken earlier in the day with Juncker, European Central Bank chief Mario Draghi and European Parliament president Martin Schulz.

Meanwhile, missing the IMF payment means Greece is cut off from new loans from the organization. And with its bailout program expiring, Greece will lose access to more than 16 billion euros ($18 billion) in financial support it has not yet tapped.

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Associated Press writers Raf Casert in Brussels, Geir Moulson in Berlin and Paul Wiseman in Washington contributed to this report.