DR Congo's famed Virunga National Park said on Thursday that the head of an armed group had been arrested over a three-year killing spree that had left 19 wildlife rangers dead. After a six-month inquiry, Virunga wardens early Tuesday arrested suspected militia chief Jackson Muhukambuto on the outskirts of the city of Butembo, park director Emmanuel De Merode told AFP. "We believe that Jackson Muhukambuto is directly responsible for the death of...