U.S. stocks fell Tuesday, with losses accelerating into the closing bell. The Dow Jones industrial average fell 396.85, or 1.5 percent, to 25,890.18. The broader S&P 500 index fell 34.40, or 1.1 percent, to 3,145.32. The technology-heavy Nasdaq composite index fell 89.76, or 0.9 percent, to 10,343.89.