Extreme heatwave across US east coast already had upended some of the weekend’s long-planned celebrations
Donald Trump’s plans to celebrate the US’s 250th birthday with “the greatest show of all” in the heart of Washington DC were disrupted on a Saturday evening by fears of a thunderstorm.
Thousands of spectators who had filed onto the National Mall for a show featuring a speech by the US president and an extensive fireworks display were instructed to evacuate the site.