US equity futures extended losses: Nasdaq futures down as much as 1%, S&P 500 futures down 0.54%, Dow futures down 0.49%.

Iranian parliament's National Security and Foreign Policy Committee member Mahmoud Nabavian said Iran should launch preemptive attacks on US interests in the Middle East to force Washington to withdraw and break the blockade.

Oxford Economics says Canada's planned retaliatory tariffs on U.S. goods, due to take effect Sept. 8 and covering roughly C$27.5 billion of annual trade (about US$19.8 billion), will shelter some domestic manufacturers but raise costs and hurt most industries, weighing on national GDP by increasing producer and consumer costs. Ontario and Quebec face the biggest hit given concentrated manufacturing exposure; Atlantic provinces and British Columbia will also be pressured as higher prices and weaker household purchasing power dampen their service-led economies.