At the opening, the Dow Jones index fell more than 100 points and traded at 31,322.07 points, down 0.55 percent.
The S&P 500 index fell 0.64 percent to 3,881.81 points, and the Nasdaq index fell 1.10 percent to 13,722.13 points.
Indices, which completed the last week with a mixed motion, showed a downward movement at the opening of the new week.
Worries about the upward trend in US 10-year bond yields were influential in the negative course of indices. 10-year bond yields climbed up to 1.39 percent in the US