A man purporting to be Boko Haram’s leader Abubakar Shekau speaks in this still frame taken from social media video courtesy of SITE Intel Group

A man purporting to be Boko Haram’s leader Abubakar Shekau speaks in this still frame taken from social media video courtesy of SITE Intel Group, released on August 10, 2016, in an unknown location. MANDATORY CREDIT Social Media courtesy of SITE INTEL GROUP/ via REUTERS