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Warning and information signs call on the public to exercise the utmost caution when bathing in the waters of Lake Lugano near Riva San vitale, Switzerland, due to a strong Cyanobacteria (Blue-Green Algae) proliferation, Wednesday, August 24, 2023. The proliferation of blue-green algeae is favoured by higher water temperatures. In cases of heavy proliferation, the bacteria can release substances that are potentially dangerous to humans and animals. (KEYSTONE/Ti-Press/Elia Bianchi)