Sept 11 (Reuters) - U.S. stock index futures extended

losses on Wednesday after data showed core inflation rose more

than expected in August.

A Labor Department report showed the Consumer Price Index

(CPI) rose 2.5% in August on an annual basis, versus estimates

of a 2.6% rise. It rose 0.2% on the month, in line with

forecasts.

The core figure, excluding volatile food and energy

components, rose 0.3% on a monthly basis against forecasts of a

0.2% rise. Annually, core inflation came in at 3.2%, versus an

estimated 3.2% increase.

At 8:33 a.m. ET, U.S. S&P 500 E-minis were down

23.75 points, or 0.43%, Nasdaq 100 E-minis were down

79.25 points, or 0.42%, Dow E-minis were down 259

points, or 0.63%.