A trader works at the New York Stock Exchange in New York, the United States, on Aug. 5, 2019. U.S. stocks plunged on Monday as investors worry that U.S. President Donald Trump's threatened new tariffs on Chinese imports will worsen trade prospects. The Dow Jones Industrial Average decreased 767.27 points, or 2.90 percent, to 25,717.74. The S&P 500 fell 87.31 points, or 2.98 percent, to 2,844.74. The Nasdaq Composite Index was down 278.03 points, or 3.47 percent, to 7,726.04. (Xinhua/Guo Peiran)