Dow futures plunge as oil tops $100 amid Iran war fears

US stock index futures dropped sharply on Monday as surging oil prices and escalating tensions in the Middle East heightened concerns about inflation and the risk of a broader economic slowdown. Futures tied to the Dow Jones Industrial Average fell more than 523 points in early trading, while S&P 500 and Nasdaq 100 futures declined by more than 1% as investors reacted to a spike in energy prices and growing geopolitical uncertainty.