Stocks took a sharp nosedive in another choppy day Monday to finish at session lows as investors fled from risky assets following S&P’s downgrade of U.S.’s credit rating last week in addition to ongoing economic jitters.

The Dow Jones Industrial Average plunged 634.76 points, or 5.55 percent, to finish at 10,809.85, well below the psychologically-significant 11,000 mark. The move marks the blue-chip index’s biggest point and percent drop since Dec. 1, 2008.

BofA [BAC  6.51   -1.66  (-20.32%)   ] and Alcoa [AA  11.33   -1.46  (-11.42%)   ]were the top laggards on the index.

The S&P 500 plummeted 79.92 points, or 6.66 percent, to close at 1,119.46, its lowest close since Sept. 10, 2010.

Nasdaq sank 174.72 points, or 6.90 percent, to end at 2,357.69, its lowest close since October 4, 2010.

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