What red peppers in Niger tell us about Boko Haram

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There's good news for farmers in Niger - the government has removed a ban on the sale of the Diffa pepper. It's being seen as a sign that the battle against Boko Haram militants is going well. So, why was the chili pepper banned in the first place and what does it have to do with terrorism? The BBC World Service Africa Editor, Mary Harper, explains..... (Photo: Red peppers in Niger. Credit: Getty Images)