Terrorist attacks and atrocities committed by Islamist militant group Boko Haram have forced hundreds of thousands of people to flee their homes and seek refuge elsewhere. While we often report on the dire situation in Nigeria and northern Cameroon, today we head to another country bearing the brunt of this crisis: Niger. Our reporter Ben Barnier has travelled to Diffa, one the world's poorest regions and now tackling an influx of 130,000 refugees.