Nigerian President Muhammadu Buhari said Sunday that militants who blew up oil pipelines on the weekend would not go unpunished.
"If the militants and vandals are testing our resolve, they are much mistaken. We shall apprehend the perpetrators and their sponsors and bring them to justice," Buhari said in a broadcast to the country.
The militant Niger Delta Avengers blew up important oil pipelines Saturday in the oil-rich Niger Delta region, government sources in Bayelsa state confirmed to Nigeria's NAN news agency.
The militants are demanding autonomous government and a greater share of the oil wealth for the local population.
Nigeria, Africa's largest economy, is dependent on oil and gas for 70 per cent of state income.
In another conflict in Nigeria, an explosion in the north-east of the country killed five people, including a mother and her infant.
The Nigerian military said Sunday that an improvised explosive device detonated near a military checkpoint along a road as a three-wheeled vehicle drove past. Authorities implied that Islamist terrorist group Boko Haram was responsible for the attack on the outskirts of Biu town in the eastern state of Borno, which has been plagued by violence.
One soldier was among the dead, and two civilians were wounded.