Stock index futures fell on Thursday, adding to weakness from the previous session, after the Federal Reserve gave a more pessimistic outlook on the U.S. economy and offered no hints about further monetary support.

* Investors hoping for positive comments from Fed Chairman Ben Bernanke were disappointed, giving them a reason to sell after a four-day rally that lifted stocks from three-month lows.

* Economic data from the labor and housing sector will provide fresh clues about the pace of economic growth. Weekly initial jobless claims due at 8:30 a.m. EDT was being closely watched, with claims seen holding steady at 415,000 after a drop last week offered hope the soft patch in the economy could be easing.

* New home sales for May, due at 10 a.m. EDT, was expected to show a dip to 310,000 from 323,300 recorded in April.

* The euro zone's private sector saw fairly tepid growth this month and without the support of Germany and France would have slipped back into contraction, data showed.

* Data from Germany showed the services industry accelerated in June but overall growth in the private sector was flat as manufacturing growth eased.

* China's factory sector barely expanded in June even as price pressures eased, reflecting the impact of monetary policy tightening and sluggish global demand.

* S&P 500 futures fell 7.8 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration of the contract. Dow Jones industrial average futures lost 55 points, and Nasdaq 100 futures shed 11.25 points.

* Oracle Corp will release fourth-quarter results later in the day, with analysts expecting earnings per share of 71 cents, up from 60 cents a year ago. Although the company has a habit of beating expectations, investors fear the software and server juggernaut will find it hard to keep up its own pace.

* Bristol-Myers Squibb Co rose 7.1 percent to $29.70 in premarket trade after the company said a blood thinner it developed along with Pfizer Inc
proved safer than warfarin in preventing strokes. Pfizer shares rose 3.8 percent to $21.05.

* European leaders meet Thursday and will try to convince financial markets they have a workable plan to help highly indebted Greece avoid a debt default.

* U.S. stocks dropped Wednesday, halting four days of gains, after the Fed cut its forecasts for U.S. economic growth this year and next.

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(Reporting by Angela Moon; editing by Jeffrey Benkoe)