The West African country has been blighted by thousands of spills in recent years.
Nigeria slipped into recession in 2016 after militants blew up oil facilities. But the government is trying to negotiate peace.
Nigeria's trade minister says the country could be a springboard for U.S. businesses in Africa, predicting good relations under President Trump.
Norway sold seven decommissioned warships to a militant leader in Nigeria's oil basin, and the U.K. facilitated the sale.
Christian pastor Yemi Osinbajo is Nigeria's acting president while Muhammadu Buhari is on sick leave.
He is Nigeria's second-highest Islamic authority and he denies misusing state funds on Rolls Royces and mobile phone bills.
Villagers in the Niger Delta wanted to sue the petroleum company in London, not Nigeria.
Economics, not ideology, is the driving force behind Nigeria's Islamist insurgency.
The West African country has been hit hard by falling oil prices and low production.
"Don't wait until we go the way of Sudan," the militant group warned.
The oil-producing region has been the site of multiple attacks by a militant group in recent months.
Petrol prices have risen by 66 percent after Nigeria's government removed a fuel subsidy.
Petrol prices will increase by two-thirds, but the government hopes it will resolve a severe fuel shortage.
Power outages and long queues for fuel have been seen as militants sabotage oil pipelines.
The West African country is experiencing a fuel shortage as militants attack pipelines.
The region's pipelines often need repair due to sabotage by militants.
People are waiting for hours to get gas in the West African country.
At least four people were killed during an election rerun in the oil-producing state.
The strike could lead to fuel shortages in Nigeria, where people are already queuing for hours to get gas.
Two of Nigeria's four state-run refineries remain closed due to attacks on oil pipelines.
A Nigerian court ordered the arrest of an ex-militant kingpin, prompting a spate of attacks on oil pipelines.