After more than eight hours of talks in Brussels overnight, eurozone finance ministers and the IMF failed to settle their deep differences on the thorny debt question.
The eurozone-IMF standoff is the final obstacle to unlocking a tranche of bailout funds that will let Greece repay 7.0 billion euros of loans due in July.
Hopes were high that the deadlock could be broken after Greek lawmakers last Thursday adopted a new round of additional, painful austerity measures.
"For us to go ahead, (the reform package) needs to be supplemented with a credible package on debt relief," Thomsen said.
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"Here we are making progress, there are not doubts about that, but we are not quite there yet," he said.
The IMF is demanding that the eurozone provide a detailed commitment to debt relief that Greece will adopt at the end of its current bailout programme, expected at the end of 2018.
The talks will resume at the next meeting of eurozone finance ministers in June.
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