* The Dow Jones industrial average <.DJI> was down 137.55 points, or 1.63 percent, at 8,311.01. The Standard & Poor's 500 Index <.SPX> was down 14.78 points, or 1.70 percent, at 857.01. The Nasdaq Composite Index <.IXIC> was down 23.79 points, or 1.54 percent, at 1,522.67.

(Editing by James Dalgleish)