The International Christian Concern (ICC) has asserted that Nigeria is the biggest killing ground of Christians today. How big a problem is Christian persecution in Nigeria compared to what goes on in other parts of the world? The three biggest terrorist organizations in the world today are ISIS, Boko Haram, and al-Shabaab. Boko Haram has been operating in Nigeria since 2009, and ISIS started a splinter group there in 2015 called Islamic State West Africa Province (ISWAP). Al-Shabaab operates out of Somalia and mainly in East Africa.