Lagos - A militant group in Nigeria's oil-rich Niger Delta says it is ending the ceasefire it declared last October.
Jomo Gbomo, who said he was a spokesman for the group Mend, said it did not believe the government would restore control of resources to local people.
Mend has demanded that residents be given a greater share in profits from oil resources and land.
It warned oil companies to prepare for what it called an all-out onslaught against installations and personnel.
In a statement announcing the end of the ceasefire, the group said that the decision had been taken "after careful consideration and extensive consultation".
Militants have carried out a series of attacks which have cost Nigeria millions in lost revenue over the years.