U.S. stock index futures point to lower open
* US stock index futures pointed to a lower open on Wall Street on Tuesday, with futures for the S&P 500 SPc1, Dow Jones DJc1 and Nasdaq 100 NDc1 down 0.9-1.1 percent.
Stock futures pointed to a lower open Friday after China's central bank tightened bank lending again, sparking fears that it will further slow global economic recovery.