US stock markets closed up today after the Federal Reserve kept interest rates stable. The Dow Jones industrial average rose 28.69 points, or 0.1 percent, to 27,910.41 points. The S&P 500 index increased by 9.05 points, or 0.29 percent, to 3,141.57 points, and the Nasdaq Composite Index advanced 37.87 points, or 0.44 percent, to 8,654.05 points. -