UN Secretary-General Antonio Guterres said Monday that countries must tackle the “underlying conditions that can lead to terrorism," such as poverty, to prevent such violence from spreading. “While we have made some significant gains over the years, terrorism and violent extremism continue to take root and grow," he told a conference on the subject in New York. Guterres called on nations to “stand as one against this global threat." “Al-Qaeda and Da’esh affiliates in Africa are rapidly gaining ground in places like the Sahel and probing southward toward the Gulf of Guinea," he said, also citing the “brutal legacy" of...