US stock market today: S&P 500, Nasdaq futures slide as US-Iran tensions flare; Brent jumps 8% by Live mint | April 20, 2026 6:07 pm | Indian Stocks, Market, News US stock futures are down 0.4% to 0.5% as tensions in the Middle East escalate, casting uncertainty over peace talks. The US Navy’s seizure of an Iranian vessel has renewed fears over oil transport, coinciding with an impending ceasefire deadline.
