U.S. stocks open lower as markets remain jittery about developments in Iran  Investing.comDow tumbles 500 points, enters correction territory as Trump's Iran extension fails to soothe markets: Live updates  CNBCUS stock markets today (March 27, 2026): S&P 500, Dow fall as oil rises above $100; Iran war uncertainty weighs on sentiment  The Times of IndiaUS Futures Drop on China’s US Trade Probe, Escalating Iran War  Bloomberg.comStocks, bonds and gold all fall in market slide  CNN