an oil spill in the Niger Delta has been blamed on the sabotage of an Italian-owned pipeline.
Oil firm Eni said repair work had been started on its Nembe-Obama line.
"The wells of Nembe South have been closed with minimal impact on production," a spokesman for the company said.
In 2009, Eni said its net output in Africa's biggest oil producer was 128,000 barrels per day.
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