Greece headed for a cliffhanger vote on austerity measures needed to keep the bailout on track as a 48-hour general strike began and European officials squabbled over the timing of a deal to unlock rescue funds.

European Union Economic and Monetary Affairs Commissioner Olli Rehn, speaking at a meeting of Group of 20 finance chiefs in Mexico City, said yesterday that a deal must be made at a meeting of EU finance ministers in Brussels on Nov. 12. A European G-20 official, speaking before Rehn and on condition of anonymity, cast doubt on the prospects for that deadline, saying officials may fall short.

Greece is under pressure to make more efforts to rein in its budget deficit and deregulate the economy. While German Chancellor Angela Merkel last month travelled to Greece to signal her willingness to keep Greece in the euro, the country is still struggling to hit its debt reduction targets amid a combination of Greek political resistance to more cuts and economic collapse.