Yields on longer-term U.S. debt, including 10-year and 30-year rates, fell slightly after the Federal Open Market Committee held rates steady. The 10-year yield dropped from 4.35% to 4.345%, while the 30-year rate slipped from 4.897% to 4.893%. Despite these changes, investors should not overreact as the Treasury market often reacts impulsively and it may take time to determine the true trajectory of yields after the Fed news conference.

Read more at Dow Jones & Co.: Treasury Yields Slipping Following Fed