President of Cameroon Paul Biya (L) walks with his Nigerian counterpart Muhammadu Buhari following his arrival at the airport in Yaounde on July 29, 2015. Nigerian President Muhammadu Buhari arrived in neighbouring Cameroon for talks on how to combat the escalating regional threat from Boko Haram Islamists. Security was tight for the 24-hour visit, after a surge of Boko Haram violence in Cameroon including an unprecedented series of five suicide bombings in the far north. AFP PHOTO / REINNIER KAZE (Photo credit should read Reinnier KAZE/AFP/Getty Images)
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AFP REINNIER KAZE