Abubakar Sani was a carpenter. A quiet and simple man, the son of a middle-class teacher, he seemed like an ordinary citizen in the northern Nigerian town of Gombi.
But nine years ago, when he was 21, his family noticed he was changing. He was going to the mosque more often, and he had befriended a man from a northeastern city where Islamist extremism was growing. Then one day he disappeared, without explanation, taking nothing with him. For years his family se...
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