U.S. stock index futures fell further on Thursday after data showed first-time filings for unemployment benefits unexpectedly rose in the latest week.

S&P 500 futures fell 10 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 dropped 74 points, and Nasdaq 100 futures lost 16.75 points.

Futures were also weighed after rating agencies said they may downgrade Greece's sovereign debt rating.

(Editing by Jeffrey Benkoe)

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