Europe's options for overcoming the debt crisis narrowed as Germany doused expectations of a breakthrough at this weekend's summit and central bankers balked at extended bond purchases.

European stocks fell for a second day after German Chancellor Angela Merkel's office knocked down what it called “dreams” that the Oct. 23 summit will be the last word in taming the crisis. Christian Noyer, head of France's central bank, ruled out a ramping up of the European Central Bank's bond-buying program as part of a multi-pronged strategy to shield countries like Italy.

While Group of 20 finance ministers and central bankers pressed European Union leaders to set out a strategy by the end of the week, divisions flared over an emerging plan to avoid a Greek default, bolster banks and curb contagion.