AI stocks turn lower, weighing on Wall Street

AI stocks fell sharply Tuesday, dragging major U.S. indexes lower despite broad market gains. The S&P 500 dropped 0.3% and the Nasdaq fell 0.7%, while the Dow Jones Industrial Average slid 173 points. Weakness began in Asia, where Samsung Electronics tumbled 6.9% in Seoul, as investors fretted that artificial-intelligence stocks had climbed too high and oil prices rose.