US stock futures fall as fading Iran peace prospects drive up oil, yields
By Shashwat Chauhan and Purvi Agarwal Aug 18 (Reuters) - Futures tied to the S&P 500 and Nasdaq slipped on Tuesday, with oil holding near recent highs and government bond yields hitting multi-year peaks as chances of a peace deal between the U.S. and Iran waned, rekindling inflation concerns.