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Stock-market carnage has slashed almost 1,600 points from the Dow in a week

MarketWatch

The Dow Jones Industrial Average on Thursday extended the previous session's gut-wrenching downturn, with the blue-chip index off by more than 300 points and all three major equity benchmarks testing fresh technical lows. The Dow DJIA, -0.45% most recently, was down 342 points, or 1.3%, at 25,256, while the S&P 500 index SPX, -0.58% was off 1.1% at 2,749, falling below its 200-day moving average, a day after marking its worst day session since Feb. 8, while the Nasdaq Composite Index also slipped further, off 0.8% at 7,358, edging further beneath its 200-day MA, viewed by technical analysts as a key dividing line between bullish and bearish momentum in an asset. Since Oct. 3, when the Dow put