Stocks are ending sharply lower after a late-afternoon slide.
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The losses extended a downturn in the market last week which gave indexes their worst weekly performance in more than two years.
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The Dow Jones industrial average slumped 222 points, or 1.4%, to close at 16,321 Monday.
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The Standard & Poor's 500 index fell 31 points, or 1.7%, to 1,874. The Nasdaq fell 62 points, or 1.5%, to 4,213.
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Energy stocks fell nearly 3%, much more than the rest of the market. Investors have been dumping those stocks as the price of oil continues to fall.
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The price of oil has been slumping as fears of waning demand grow even as production remains high.  (AP)
