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A 10-minute-long storm in the Girona region of Catalonia, Spain, saw giant hailstones smash windows, destroy roofs and down power lines.
A 20-month-old child died and about 50 other people reported injuries.
Parts of Spain have experienced a severe draught, and the hot summer has meant the nearby Mediterranean sea is warmer than usual for this time of year, making violent tropical storms are more likely.