The municipal bankruptcies in Detroit and Stockton, California, may foretell more widespread problems in the United States than is implied by current bond ratings, a top Federal Reserve official said on Monday. “While these particular bankruptcy filings have captured a considerable amount of attention, and rightly so, they may foreshadow more widespread problems than what might be implied by current bond ratings,” New York Fed President William Dudley said at a workshop on Chapter 9 bankruptcies.