UnitedHealth shares fall after WSJ flags Justice Department investigation. Follow along for live updates on stocks and other markets, including the Dow Jones Industrial Average, S&P 500 and Nasdaq ...

Worries about the economy sent the stock market tumbling again on Friday. The Dow slid 804 points, or 1.8%, in recent trading. The S&P 500 was down 1.7%. The Nasdaq Composite was down 2.1%.

The selloff came as more than $2.7 trillion worth of options expired, an event which typically spurs heightened volatility.

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