It was a quiet evening in Agadez, a bustling Saharan city in the centre of Niger. Thirty-five year old Agali Ahmed was sipping tea at a friend’s place, as he often did, when he received a message: police were at his uncle’s house. When he got there, Ahmed saw men in plainclothes, standing around the building’s gate. Inside, more men were searching the apartment. Three white men, who Ahmed guessed were Spanish, asked for his phone and started taking pictures of him. They told him to follow them…