Investors on edge as Fed decision looms and markets show signs of stress.

U.S. Treasury yields fell as investors awaited the Federal Reserve's latest interest rate decision and guidance on central bank policy. The Fed is expected to announce a 25 basis point hike in interest rates, but investors are also hoping for hints about the policy outlook and whether further rate hikes are on the table or a pause to rate increases is imminent. Concerns about elevated rates leading to economic downturn have spread in recent weeks, but officials have indicated that rate hikes could be halted, although inflation is still too high to consider rate cuts.