European stock markets have fallen sharply as concerns mount over Greece's future in the euro.
Shares fell after a report quoted former Greek Prime Minister Lucas Papademos saying that the Greek government may be making preparations for leaving the euro.
By lunchtime shares in London, Paris and Frankfurt were down about 2%.
Adding to the negative mood, Germany's central bank said the developments in Greece were "highly alarming".
"Greece is threatening not to implement the agreed reforms and consolidation measures," the Bundesbank said in its latest monthly report.
It said that scenerio could create "substantial" challenges for the eurozone and Germany, but the situation would be "manageable via careful crisis management".
In an interview with Dow Jones Newswires, former Greek Prime Minister Lucas Papademos said: "It cannot be excluded that preparations are being made to contain the potential consequences of a Greek euro exit."
"The risk of Greece leaving the euro is real and it depends effectively on whether the Greek people will support the continued implementation of the economic programme," he said.
Despite the prospect of Greece leaving the euro, the head of the IMF, Christine Lagarde, is keeping up the pressure on Greece to fix its finances.
In an interview with the BBC, Ms Lagarde said there had to be more tax collection and structural reform.
That is despite the deep unpopularity of austerity measures imposed on Greece by the IMF and European Union in return for bailout funds.
Greek politicians are divided over whether to continue supporting those austerity measures and face a 17 June election.
"The Greek population has made huge efforts. But they have more to do. There are more structural reforms to be had, there is more tax to be collected and that has a price," Ms Lagarde said in an interview with the BBC's Today programme.
Many analysts think that Greece may abandon the austerity measures and be forced out of the euro.
Ms Lagarde said the IMF did not like the that prospect, but that it was "prepared for all possible situations".
Read more at theBBC....