The Globe and Mail reports in its Saturday edition that bank stocks retreated Friday as investors wrestled with uncertainty over when the United States Federal Reserve will hike interest rates and the possible outcome of a larger-than-expected $14-billion (U.S.) fine against Deutsche Bank for its part in the mortgage backed securities debacle. Dispatches from Bloomberg and Reuters report that Deutsche Bank shares slumped 9.35 per cent on Friday. Dow components Goldman Sachs and JPMorgan fell more than 1 per cent each. All of Canada's Big Six banks lost ground on Friday. Last week's volatility ended a long stretch of stability. The uncertainty that has returned to global financial markets comes as central banks signal they are rethinking their approach to the monetary stimulus that has bolstered assets from stocks to bonds for the past half decade. Yield curves steepened, commodities prices tumbled and European shares headed for the worst week since June. Traders have all but ruled out the possibility of the Fed raising interest rates at its meeting that starts Tuesday. Residual doubts, however, and questions about when the Fed may finally pull the trigger still hurt sentiment.