Extreme heatwave across US east coast already has already 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 Saturday evening by fears of a thunderstorm.

Thousands of spectators who had filed into the national mall for a show featuring a speech by the US president and an extensive fireworks display were instructed to evacuate the site.

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