Markets could be skittish in the week ahead as the Federal Reserve meets and investors increasingly fret about whether the U.K. will vote this month to break away from the European Union.

The Fed is not expected to take action Wednesday, but the actions of other central banks will likely continue to be felt as their easing programs wash over global bond markets, sending some yields to record lows and driving buyers into the relatively better value of U.S. Treasurys. The European Central Bank added corporate debt to its purchases in the past week, adding more downward pressure on yields.