Health alerts issued to 100 million Americans, with emergencies declared in Washington and Philadelphia, as temperatures pass 110 degrees in some areas
Blazes burn large swaths of land in France, Portugal, Spain and Greece; climate change blamed for intense heatwave set to break temperature records in Britain
Nationalities of the 6 known dead not disclosed; 16 cars unclaimed in parking lot; at least 9 hikers injured; collapse occurred during higher-than-usual temperatures
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