US stock futures cautious ahead of Fed decision By: CNBC.com News July 29, 2014 at 05:04 AM EDT U.S. stock-index futures declined on Tuesday as investors looked to economic reports, earnings and the Federal Reserve's mid-week policy decision. Read More >> Related Stocks: American Express Herbalife Ltd Merck & Co Pfizer Sentinelone Inc Cl A Twitter, Inc. United Parcel Service