Royal Dutch Shell has shut three oil flow stations in Nigeria's Niger Delta¹ region after a pipeline² was sabotaged³, a company spokeswoman has said.

荷兰皇家壳牌公司女发言人称，壳牌公司在尼日利亚尼日尔三角洲地区的一条输油管线被破坏，该公司因此关闭三座炼油厂。

She said Saturday's leak漏洞，泄露 on the Trans Ramos oil pipeline was confirmed "to have been caused by sabotage破坏，怠工". The leak was later stopped.

No group has so far claimed responsibility for the attack.

It came shortly after Nigeria's militant好战的 group Mend said it was ending the truce⁵ it declared last October.

An alleged⁶ group spokesman said Mend 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全部的，毫无保留的 onslaught猛攻，突击 against installations设备，设施 and personnel.

Analysts⁷ later said it was not immediately clear if this statement came from the whole of Mend - the Movement for the Emancipation⁸ of the Niger Delta - or just a faction派别，小团体 that did not accept the offer of an amnesty大赦，特赦 from Nigerian President Umaru Yar'Adua.

Militants¹⁰ have carried out a series of attacks which have cost Nigeria millions in lost revenue收入，税收 over the years.

The attacks have meant that facilities in the area have been unable to work beyond two-thirds capacity, costing $1bn a month in lost revenue.