Chevron’s Otunana station in Niger Delta “is currently engulfed in fire after being overwhelmed by our fighters,” MEND said in a statement.

A spokesman for Chevron, Scott Walker, could not immediately confirm the claim but said the report was being investigated.

The group had warned of new attacks last weekend.

MEND has staged several attacks on international oil facilities in southern Nigeria as part of its campaign to get what it calls a fairer distribution of the region’s oil wealth to local people.

Nigeria’s oil production has been cut by more than a quarter because of the militant campaign over the past three years.