Dow, S&P end up on Yellen; tech sinks Nasdaq

NEW YORK (Reuters) - U.S. stocks mostly rose on Wednesday as the Federal Reserve signalled it will continue to support the economy, but the Nasdaq fell for a second session on weakness in Internet names. The Dow Jones industrial average <.DJI> was up 117.52 points, or 0.72 percent, to end unofficially at 16,518.54. The Standard & Poor's 500 Index <.SPX> was up 10.53 points, or 0.56 percent, to finish unofficially at 1,878.25. The Nasdaq Composite Index <.IXIC> was down 13.09 points, or 0.32 percent, to close unofficially at 4,067.67. (Reporting by Ryan Vlastelica; Editing by Jan Paschal)