Four people died in Spain, two in France and two in Italy as an early summer heatwave continued to grip much of Europe on Wednesday, triggering health alerts and forest fires and forcing the closure of a nuclear reactor at a Swiss power plant.

Two people were found dead by firefighters tackling a blaze in Spain's Catalonia region on Tuesday, as Europe endures scorching temperatures during the ongoing heatwave. In a statement, Catalan authorities said the two bodies were found after firefighters extinguished a fire in the Torrefeta area, near the town of Coscó.

A heat dome swept across parts of Europe on Tuesday, leading authorities to raise warnings and tourists to find ways to beat the heat.