Royal Dutch Shell has shut three oil flow stations in Nigeria's Niger Delta region after a pipeline was sabotaged.
The company said a leak on Saturday on the Trans Ramos oil pipeline was confirmed "to have been caused by sabotage". The leak was later stopped.
No group has so far claimed responsibility for the attack.
It came shortly after a rebel group, Mend, said it was ending a truce it declared last October.
The BBC reports previous oil pipeline attacks have cost $US1 billion per month in lost revenue.