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The Swiss bank, along with others, manipulated a key interest rate that in turn influences what borrowers around the world pay. Chief Executive Sergio Ermotti says UBS was "disappointed to discover what happened."

RBS, the Royal Bank of Scotland, is already in a tough spot. It's among several banks being investigated for allegedly rigging the interbank lending rate known as LIBOR. As Steve Inskeep reports, Friday it warned that it faced several potential lawsuits over those allegations.