Wall Street sinks to end turbulent week

NEW YORK Hedge fund selling in advance of a Saturday deadline contributed to the market's gyrations, which left the Dow Jones industrials down 337 points, or 3.82 percent, at the 8,497 level.

The broader Standard & Poor's 500 index fell more than 4 percent.

Some retrenchment was to be expected after Thursday's big advance, in which the Dow rallied more than 550 points after falling near its lows for the year.

But there was also plenty of discouraging news for investors to focus on, including comments from Federal Reserve Chairman Ben Bernanke that the markets remain under "severe strain" and a sobering report on October retail sales.