The Movement for the Emancipation of the Niger Delta said it carried out the attack.

尼日尔三角洲解放运动称他们发动了这次袭击。

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Nigeria's most prominent militant group, the Movement for the Emancipation of the Niger Delta, had warned of the explosions about an hour before they occurred.

尼日利亚最臭名昭著的激进组织尼日尔三角洲解放运动在爆炸发生约一小时前曾发出警告。

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The Movement for the Emancipation of the Niger Delta (MEND) says armed with assault rifles and heavy machine guns raided an oil facility jointly operated by Royal Dutch Shell and Chevron in Rivers state.

VOA: standard.2009.12.21

But security is still an issue after a warning in June by the Movement for the Emancipation of the Niger Delta rebels suggesting that the safety of visiting teams and fans could not be assured.

VOA: standard.2009.10.22

An email purportedly from the Movement for the Emancipation of the Niger Delta (Mend) said it was responsible for the ambush in southern Nigeria on Friday.

BBC: Nigerian 'Mend' militants claim Niger Delta ambush

The Movement for the Emancipation of the Niger Delta (MEND) is an insurgent group that demands compensation from petroleum companies for the pollution and deaths they have caused.

CENTERFORSECURITYPOLICY: Nigeria in flux

So, Ofeibea, the group that's holding the oil workers is called the Movement for the Emancipation of the Niger Delta, and it's fairly new in Nigeria, but well organized, I gather.

NPR: Nigerian Authorities Seek Release of Contractors