View image in fullscreenBandar Abbas, IranThree boys play in the shallow waters of the strait of Hormuz as a plume of smoke rises from an explosion in the distancePhotograph: Razieh Poudat/APShareView image in fullscreenSeoul, South KoreaWomen use portable fans to cool off at the Gyeongbokgung Palace. South Korea issued its first emergency heatwave alert on Sunday under a new warning system launched this year, advising people to halt outdoor activities and keep coolPhotograph: Jade Gao/AFP/Getty ImagesShareView image in fullscreenManchester, UKFirefighters