Oil has surged past $100 per barrel, rattling markets as the war in Iran shows no signs of easing. With Dow, S&P 500, and Nasdaq 100 futures all down before the opening bell, investors brace for a turbulent trading day.

Asian markets turned downward on the heels of a subdued Wall Street session, with technology shares bearing the brunt of selling pressure. While U.S. futures moved slightly upward and crude oil prices rose, caution remained prevalent among investors.