br/Nigeria's main militant group has extended its ceasefire by 30 days but warned that it would continue to attack oil and gas installations if the government doesn't engage in meaningful talks. br/br/Movement for the Emancipation of the Niger Delta, MEND and other militant groups had attacked oil installations in the region and this led to the use of military force by the government and later the authorities called for an amnesty.br/br/The amnesty involves the surrender of arms and stipends to be paid to the militants. After surrendering their arms recently, some of the militants complained that the money agreed was not paid.