A male silverback mountain gorilla sits in the dense forest on the slopes of Mount Bisoke volcano in Volcanoes National Park, northern Rwanda, Sept. 4, 2015. Ben Curtis/AP, FILE "The fact that a ...

Mount Nyiragongo ... world's most active volcanoes, in eastern Democratic Republic of Congo, erupted late Saturday and forced thousands of residents in North Kivu’s Goma to flee to Rwanda.