Source: http://europe.newsweek.com/nigeria-shuts-two-oil-refineries-niger-delta-militancy-looms-418267?rm=eu A worker walks past Port Harcourt’s refinery, September 16, 2015. Nigeria’s state oil company has closed two of its refineries after attacks by militants.PIUS UTOMI EKPEI/AFP/GETTY IMAGES Militants attacked pipelines in the Niger Delta…