A plume of smoke rises from an oil tanker "Golden Lucy" after an explosion in Port Harcourt, Nigeria, January 11, 2008. Militants fighting for autonomy in Nigeria's oil-producing south detonated a remote controlled bomb on an oil tanker, causing a large fire. It was the second rebel attack on Africa's largest oil industry in a week, but exports of crude oil were unaffected, industry sources said. REUTERS/Handout (NIGERIA). EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.