Stock futures fell as tensions between the U.S. and Iran escalated, with Dow Jones Industrial Average futures dropping by 425 points, S&P 500 futures losing 8%, and Nasdaq-100 futures. This follows the seizure of an Iranian-flagged cargo ship, which is under sanctions due to its previous history of illegal activity. President Donald Trump also threatened to destroy all power plants and bridges in Iran if they didn't agree to a deal with the United States. This comes after Iran declined to join another round of peace talks in Pakistan planned by the US. Despite Iranian declarations that the Strait of Hormuz was reopened, vessel traffic through that key shipping lane was restricted again.