Movement for the Emancipation of the Niger Delta
Basically indigenous tribes pissed off about the oil wealth being siphoned off through PSA's with big oil and by corrupt leaders.
From the Wiki, appears accurate.
The Movement for the Emancipation of the Niger Delta ("MEND") is a militant indigenous people's movement dedicated to armed struggle against what they claim to be the exploitation and oppression of the people of Niger Delta and the degradation of their natural environment by foreign multinational cooperations involved in the extraction of oil in their homeland. MEND has been linked to attacks on foreign owned petroleum companies in Nigeria.
MEND's stated goals are to localize control of Nigeria's oil and to securing reparations from the national government for pollution caused by the oil industry. In an interview with one of the group's leaders, who used the alias Major-General Godswill Tamuno, the BBC reported that MEND "was fighting for "total control" of the Niger Delta's oil wealth, saying local people had not gained from the riches under the ground and the region's creeks and swamps." <1>http://en.wikipedia.org/wiki/Movement_for_the_Emancipation_of_the_Niger_Deltahttp://news.bbc.co.uk/1/hi/world/africa/4732210.stmThe Nigerian oil is the good stuff, sweet, light crude. And I expect it to be offline in the next five years.