Dollar firms after Iran says it closed Strait of Hormuz; Brent rises 1.30% to $81.62 and pound slips

Iran said it had closed the Strait of Hormuz, and shipping data showed the number of vessels transiting the waterway fell sharply on Sunday. Brent crude futures rose 1.30% to $81.62 a barrel as markets reacted to the confirmed disruption to physical supply. U.S.-Iran talks continued for a second day in Switzerland, but President Donald Trump threatened to restart the war in the Middle East, adding to geopolitical strain.