Stock index futures tumbled on Friday after the U.S. economy added far fewer jobs than expected in June, confounding expectations for more signs of strength in the labor market.

S&P 500 futures sunk 16.2 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures fell 104 points, and Nasdaq 100 futures fell 21.50 points.

(Editing by Kenneth Barry)

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