The Movement for the Emancipation of the Niger Delta (Mend), has threatened to take up arms again, saying the Nigerian government has not stuck to its side of a ceasefire agreement.
The group's fighters laid down their weapons as part of a government-led amnesty deal in return for a promise of cash and jobs.
But with the president out of the country for medical treatment the deal has virtually collapsed.
Al Jazeera's Yvonne Ndege reports from the Niger Delta. (15 Feb 2010)