The Federal Reserve increasingly faces risks if it waits too much longer to rase rates, making a gradual policy tightening likely, Boston Fed President Eric Rosengren said on Friday. "Risks to the forecast are becoming increasingly two-sided," he said, adding that while a slowdown overseas remains a concern, the U.S. economy has proven resilient and could even overheat if Fed policy remains unchanged for too much longer. Read the original story from Reuters.