Human rights group Amnesty International has released satellite images showing what it says is "indisputable and shocking evidence" of the scale of last week's attack on two Nigerian towns by Boko Haram fighters.
Before and after images of two neighbouring towns, Baga and Doro Gowon in northern Nigeria taken on January 2 and 7, show the devastating effect of the attacks which left more than 3,700 structures damaged or completely destroyed.
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