Mend had stepped up its attacks on oil facilities in the Niger Delta [EPA]

The ceasefire comes after Mend declared it was waging an "oil war" and carried out a string of attacks on industry targets, particularly against Royal Dutch Shell.

A statement said that the group would begin a unilateral ceasefire on Sunday, exactly one week after announcing its oil war. The group said the ceasefire would last until further notice.

Crippled output

Shell, which has confirmed only two of the six attacks claimed by Mend, on Friday declared force majeure on exports from the Bonny terminal.

The legal move freed the company from delivery obligations in the wake of attacks on the oil terminal.

Mend's statement comes a day after the group said it had destroyed a Shell-run pipeline.

The group last week declared it was fighting a "war" against the oil industry after what it called an attack on its positions by the Nigerian army.

Nigeria is Africa's most populous nation, with 140 million people, and about 90 per cent of the country's foreign currency earnings come from oil and gas.

Amid the unrest in the oil-producing region's output has dropped to between 1.8 million and two million barrels per day, down from an average of 2.6 million bpd two years ago.

Mend said on Sunday it will renew attacks if the Nigerian military targets it again.

"We hope that the military has learnt a bitter lesson... The next unprovoked attack will start another oil war," its statement said.

Mend has said that more of Nigeria's oil wealth should be channelled back to the local population.

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