Greece says it is still hopeful for a last-ditch deal to avoid defaulting on its debt, as bank customers rushed to withdraw money from their accounts.
The European Central Bank has agreed to extend its emergency funding to Greek banks - believed to be worth up to $3.4bn.
But this support is only until Monday, when Eurozone leaders meet for an emergency summit.
Al Jazeera’s John Psaropoulos reports from Athens.
