They arbitrarily detained workers in the tankers for months and demanding for ransom for their release . Last year , they attacked various oil installations and facilities of oil company Shell that resulted to oil price increase . They also attacked a facility of Chevron , forcing the company to halt operations in the region for that year (Obi . In 2005 , the central government called the National Political reform Conference . Representatives of the Niger Delta raised various concerns on the development of the region...











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