Dow down over 600 points, Nasdaq tanks 3.6% with stocks near session lows in final hour of trade

Stocks were trading near session lows heading into the final hour of trading Thursday, after economic data reinforced expectations the Federal Reserve will continue aggressively tightening monetary policy. The Dow Jones Industrial Average was down 647 points or 2.2%, while the S&P 500 dropped 2.8% to 3,616. The Nasdaq Composite tumbled 3.6% to 10,653.

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