Wall Street opens lower on China, Ukraine worry

US stocks fell at the open on Monday on concern China's economy is continuing to lose momentum and as pro-Russian separatists ambushed Ukrainian forces, escalating a conflict that has kept global markets on tenterhooks recently.

The Dow Jones industrial average fell 58.31 points, or 0.35%, to 16,454.58, the S&P 500 lost 7.35 points, or 0.39%, to 1,873.79 and the Nasdaq Composite dropped 23.877 points, or 0.58%, to 4,100.021.