Nigeria, Boko Haram loses his number three: Amir Khalifa UmarHe was killed by the Multinational Joint Task Force (MNJTF) during some raids on Tunbum… Nigeria, Boko Haram loses his number three: Amir Khalifa Umar13 January 2020Francesco BussolettiDefence, Defence and Security He was killed by the Multinational Joint Task Force (MNJTF) during some raids on Tunbum Sabon, near Lake Chad. Other ISWAP commanders also died in strike in Kwalaram.