U.S. stock index futures turned positive on Wednesday but gains were capped as Japan struggled with a nuclear crisis in the aftermath of a massive earthquake and tsunami and as clashes in Bahrain lifted oil prices,

S&P 500 futures rose 2 points and were above 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 added 2 points, and Nasdaq 100 futures rose 3.5 points.

(Reporting by Edward Krudy; editing Jeffrey Benkoe)

Japan