US stock index futures edged lower, with S&P 500 at 7,226.75, Nasdaq 100 at 27,749, Dow Jones flat at 49,079.
Oil prices surged roughly 6% after Iran launched attacks in the Strait of Hormuz, striking vessels and igniting a UAE oil port.
Major U.S. indices closed lower, S&P 500 down 0.4% to 7,200.81, Nasdaq down 0.2% to 25,067.80, Dow down 1.1% to 48,941.90.
Upcoming market focus includes Q1 earnings from AMD, Shopify, KKR, MSTR and April non‑farm payrolls data due Friday later.