Many of the games are taking places in cities with high temperatures and humidity, such as Guadalajara and Monterrey, Mexico, as well as Los Angeles, New York and Atlanta.

FIFA has made a last-minute reversal of its World Cup stadium policy, banning fans from bringing water bottles into venues across North America.

But seven days before the tournament kicks off on 11 June, bottles - along with cups, jars and cans - have been prohibited, with Fifa saying it will lower the risk of injury caused by fans throwing mi...