The Dow Jones industrial average fell more than 800 points Thursday as investors grapple with the most volatile stock market in years.

The Dow started trading Thursday down hundreds of points, falling 806 points below its Wednesday close around 3:45 p.m.

U.S. stocks have experienced a week of crazy swings as investors fear the impact of rising Federal Reserve interest rates on the market. The Dow, Nasdaq and S&P 500 were all down roughly 2.5 percent Thursday afternoon after the indexes closed Wednesday with minor losses.

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The Dow fell more than 2,000 points from midday Thursday to Tuesday morning before closing 567 points higher Tuesday.

President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Wednesday said traders selling stocks are making a "big mistake," and that those trading stocks will regret their actions.



"In the 'old days,' when good news was reported, the Stock Market would go up. Today, when good news is reported, the Stock Market goes down," Trump tweeted. "Big mistake, and we have so much good (great) news about the economy!"

Trump’s warning differs with the reaction of his Treasury secretary and Republican lawmakers, who've called the downturn a natural, expected reaction to economic conditions.

Economists also attribute the volatility to algorithmic trading, which tracks market swings and rising bond yields.

Updated at 3:44 p.m.