Food crisis, malnutrition, cholera threaten. This is a triple crisis which is threatening millions of people in Borno State, Nigeria. Since 2009, 2.5 million people have been displaced by Boko Haram’s abuses. Thierry Benlahsen, Head of Emergencies of SOLIDARITÉS INTERNATIONAL analyses the security and sanitary crisis in Nigeria, and expresses himself about necessity of this intervention. Focus on our action.