Greek euro threat looms over Cannes G20 summit

CANNES, France, Nov 3 (Reuters) - The threat of a Greek exit from the euro zone hung over a meeting of G20 leaders on Thursday after France and Germany made it clear that Athens must decide urgently whether it wants to stay in the 12-year-old currency bloc.

The summit on the French Riviera had been meant to focus on reforms of the global monetary system and steps to rein in speculative capital flows, but a shock decision by Greek Prime Minister George Papandreou on Monday to call a referendum on a new EU/IMF aid package for his country has upended the talks.