In pictures: Fighting for Nigeria's oil

Mr Dokubu-Asari claims to control three local government areas - including Tombia which has been torn apart by fighting in the last year.

He says the town - and its church pictured here - was destroyed by a rival gang, the police and the army. But the authorities blame the devastation on a clash between The Icelanders and Mr Dokubu-Asari's men.

Last month, the police and the army attacked another local village in the area in a vain attempt to capture Mr Dokubu-Asari and his men.