Credit: Reuters Exxon (XOM.N) has shut a pipeline off the coast of Nigeria's Akwa Ibom state after an oil leak started by an unknown cause, the company's local unit said on Saturday. The U.S. major's outage will add to production problems in Africa's biggest crude exporter, after fellow oil majors Shell (RDSa.L) and Eni (ENI.MI) reported recent disruptions at onshore sites due to
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