By Ovunc Kutlu
NEW YORK (AA) - The U.S. stock market opened mixed on Tuesday.
The Dow increased 12 points to begin trading at 21,421 points.
The S&P 500 lost 1 points to open at 2,426 points, and the Nasdaq fell 4 points to start the day at 6,172 points.
The market and investors are focused on the Federal Reserve Chair Janet Yellen's testimony in the House Financial Services Committee later Tuesday.