The Swiss franc weakened vis-à-vis the U.S. dollar today as the greenback tested offers around the CHF 1.1660 level and was supported around the CHF 1.1510 level. Swiss National Bank said UBS and Credit Suisse are the world’s largest banks. SNB President Roth added the central bank still has some emergency ammunition to content with the credit crisis. U.S. dollar offers are cited around the CHF 1.1800 figure. The euro came off vis-à-vis the Swiss franc as the single currency tested bids around the CHF 1.4820 level while the British pound gained ground vis-à-vis the Swiss franc and tested offers around the CHF 1.6795 level.