On Monday, Prime Minister Lucas Papademos chaired a ministerial meeting on potential violence during independence-day celebrations on March 25.
Greece has been locked out of the markets by sky-high interest rates and has been relying on funds from an initial euro110 billion ($145 billion) bailout since May 2010.
Despite receiving more than euro70 billion ($92 billion) of the initial rescue loans and passing the austerity measures, the country remains unable to service its debts as the economy has plunged into a deep recession.
European leaders agreed last October that Greece needed a second bailout if it was to avoid a disorderly default that could have dragged down the euro.
Elena Becatoros and Derek Gatopoulos in Athens, and Gabriele Steinhauser in Brussels also contributed to this report.
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