Wall Street was down on Thursday as uncertainty about the Middle East lifted oil prices and Treasury yields, but stocks came off session lows after Reuters reported US and Iranian negotiators were exploring a deal to reopen the Strait of Hormuz. The S&P 500 and Nasdaq pared losses after the report that US and Iranian negotiators in New York were exploring a path out of war that would also include Washington lifting its economic blockade of Iran. US and Iranian leaders exchanged barbs this…