A Nigerian militant group has claimed to have blown up two key pieces of oil infrastructure and a gas pipeline in the Niger Delta this week.
There has, however, been no independent confirmation of any such attacks.
The Joint Revolutionary Council (JRC), a coalition of ex-militants and community leaders, said it had blown up Royal Dutch Shell's Tura manifold, which is connected to the Bonny export terminal, during the early hours of Wednesday, reports Reuters.
JRC said that in the early hours of Thursday its fighters had then attacked a pipeline in Chanomi Creek, which belongs to state oil firm NNPC and carries crude oil to the Kaduna Refinery.
They also claimed responsibility for bombing a gas pipeline to the commercial hub of Lagos.
"The actions are continuous and are preparatory to the final war," the JRC said in a statement.
Movement for the Emancipation of the Niger Delta, the main militant group in the region, said last month it was ending a ceasefire and threatened renewed attacks on Africa's biggest oil and gas industry amid delays to an amnesty programme caused partly by the absence of President Umaru Yar'Adua, according to the news agency.