ARMED men have killed at least 137 people in southwestern Niger, local government officials said, revising the toll up from a previous estimate of about 60. The attackers raided three villages in the Tahoua region, which borders Mali. A security source blamed Islamic State, whose local affiliate is active in the zone. Alfouzazi Issintag, mayor of Tillia, the rural commune to which the villages belong, told Reuters there were about 60 deaths but that he did not yet have a final toll. A village leader in the region who requested anonymity put the number of people killed at around 70.…