U.S. futures for the S&P 500 were down 0.7% and futures for the Dow Jones Industrial Average were flat. Changes in futures do not necessarily predict movements after the opening bell.

In Europe, the Stoxx Europe 600 dropped 0.2% in morning trading. Zealand Pharma rose 9% and A.P. Moeller-Maersk B rose 8.3%. On the other hand, Infineon Technologies slipped 4.8%, and Redcare Pharmacy fell 4.5%. The FTSE 100 lost 0.2%. Other stocks in Europe were mixed as France's CAC 40 was flat and Germany's DAX fell 0.3%.

The Wall Street Journal Dollar Index dropped 0.1% to 95.97.

In commodities, Brent crude dropped 0.3% to $94.72 a barrel, and WTI crude fell 0.8% to $92.34 a barrel. The European benchmark price for natural gas, the Dutch futures contract TTF, was up 0.3% to 48.89 euros a megawatt hour.

The German 10-year Bund yield was flat at 3.021%, and the yield on the 10-year U.S. Treasury declined by 2 basis points to 4.464% from 4.481%. Bond prices and yields move in opposite directions.