Nigeria arrests 'Avengers' oil militants

                                     Several militant groups in the Niger Delta have attacked oil facilities in the past                

The Nigerian army has arrested several suspected members of a militant group called the "Niger Delta Avengers" (NDA), thought to be behind recent attacks on oil pipelines in the south.

The country's oil production has been severely disrupted by the attacks.
US oil giant Chevron shut down an offshore platform this month after an attack claimed by the Avengers group.
Many militants joined an amnesty programme in 2009 after an insurgency in the oil-rich delta region.
Nigeria has long been Africa's largest oil producer, but its economy is currently facing difficulties due to the recent drop in global oil prices.

    

Most of Nigeria's oil wealth comes from the Niger Delta, an area which remains poor and underdeveloped.
Previous insurgent groups said they were fighting so local people could benefit more from their region's natural resources.
Oil spills have also resulted in environmental devastation over the years