There have been reports gunmen have once again raided oil facilities in southern Nigeria.
The latest attack occurred overnight at a pumping station in Bayelsa state, run by Italian company Agip.
On Monday, car bombs went off outside foreign oil companies in Port Harcourt, where many refineries are based.
And recently, three police officers were killed in another militant attack on a pumping station run by France’s Total in the Niger Delta. A spokesman said the station in Rivers State has closed.
The largest oil operator in the country, Royal Dutch Shell, has decided to pull out its staff and their families due to the growing violence.
Earlier this month, four foreign workers including three Italians were abducted and are still being held. The kidnappers are separatists fighting for more control of the country’s oil wealth.
Nigeria is Africa’s biggest oil producer but it is losing around a quarter of its production because of the fighting.