Among the events disrupted by the sweltering heat was the Great American State Fair on the National Mall in Washington, a centrepiece of President Donald Trump's efforts to mark the nation's 250th birthday.

A dangerous heatwave disrupts Fourth of July celebrations across the eastern U.S., leading to numerous event cancellations and delays.

A dangerous heatwave disrupts Fourth of July celebrations across the eastern U.S., leading to numerous event cancellations and delays.