Usd/maj. - San Francisco Federal Reserve Bank of President Janet Yellen said it was 'premature' to think about the Fed's possible strategy to raise interest rates once the U.S. economic slowdown has passed. Yellen indicated that the Fed needs to stay focused on downside risks to growth and the factor of 'fear and caution' that could already be at play, similar to those seen in the early 1990s U.S. recession.