US STOCKS-Wall St slips on rate uncertainty, economic data
* Crude oil lower; energy shares slip
* Apple, Twitter to report after the close
* Rite Aid surges on reports Walgreens in buyout talks
* Indexes down: Dow 0.3 pct, S&P 0.5 pct, Nasdaq 0.3 pct (Updates to late afternoon)
By Caroline Valetkevitch
Oct 27 (Reuters) - U.S. stocks slipped on Tuesday on uncertainty about the U.S. rate outlook and after a gauge of U.S. business investment plans fell for a second straight month.
Declines in crude oil weighed further on energy shares, and the S&P energy index, down 1.4 percent, led sector declines for the S&P 500.
Shares of Apple were down 0.5 percent at $114.68 ahead of its results after the close. Investors will watch for the iPhone maker's China sales and its forecast for the crucial holiday quarter.
The Federal Reserve began its two-day policy meeting. While expectations of a rate hike this week are slim, investors are looking for clues on when the Fed will begin to raise interest rates. Continuación...