U.S. stocks reversed course to close lower Tuesday. The Dow Jones industrial average fell 120.93, or 0.5 percent, to 25,777.90. The broader Standard & Poor's 500 index fell 9.22, or 0.3 percent, to 2,869.16. The technology-heavy Nasdaq composite index fell 26.79, or 0.3 percent, to 7,826.95.