The leaders of Nigeria and Cameroon pledged on Thursday to improve the exchange of intelligence and security cooperation along their border in a bid to tackle Nigerian Islamist militant group Boko Haram. Concluding his first visit to Cameroon since he was elected in March, Nigerian President Muhammadu Buhari and his Cameroonian counterpart Paul Biya voiced support in a joint statement for a planned multinational task force to fight Boko Haram, which has sworn allegiance to Islamic State. Moki Kindzeka reports from Yaounde.