U.S. stock index futures pointed to a lower open on Friday, extending losses from the previous session, as investors became concerned about the inflationary effects of the Federal Reserve's move to buy long-term Treasuries.

At 1015 GMT (6:15 a.m. EDT), futures for the Dow Jones, S&P 500 and Nasdaq were down 0.5-0.9 percent.

The FTSEurofirst 300 <.FTEU3> index of top European shares was down 1.3 percent, tracking Wall Street's losses on Thursday. Banks were the biggest fallers.

The Dow Jones industrial average <.DJI> and Standard & Poor's 500 Index <.SPX> lost 1.2 and 1.3 percent respectively, on Thursday.

Federal Reserve chairman Ben Bernanke speaks on The Financial Crisis and Community Banking in Phoenix at 1600 GMT (12 p.m. EDT).

The Economic Cycle Research Institute index is due at 1430 GMT (10:30 a.m. EDT). It fell to a 14-year low last week.

There are no major U.S. companies due to report.

(Reporting by Brian Gorman; Editing by Dan Lalor)

Ben Bernanke Investment