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At least 39 unarmed men in their teens and 20s were killed in an assault by Nigerian troops on Friday. The killings occurred during an ongoing campaign against Boko Haram, an armed group that wants to create an armed state in the north. The victims all lived in Maiduguri, a city widely seen as the stronghold of the group. The troops raided four neighborhoods in the city, allegedly rounding up young men and executing them on the spot.