The CurrencyShares Euro Trust (NYSEArca: FXE) was down 0.3% while the PowerShares DB U.S. Dollar Index Bullish Fund (NYSEArca: UUP) was 0.2% higher.

The U.S. dollar acts as a safe-haven currency since global investors would convert to dollar and purchase U.S. Treasuries in uncertain market conditions.

iShares Barclays 7-10 Year Treasury Fund

Read the disclaimer; Tom Lydon is a board member of Guggenheim Investments.

For more information on U.S. debt, visit our Treasury Bonds category.

Max Chen contributed to this article.