Critics claim the arrest of media mogul Raymond Dokpesi, the director of opposition presidential candidate Ibrahim Babangida's campaign, was politically motivated.
Henry Okah, the former leader of the Nigerian rebel group that claimed responsibility for a car bomb that killed 12 people in Nigeria's capital, Abuja, on Friday, is due in South African court Monday.
The Nigeria explosion prompts blogger Jeremy Weate, an Abuja resident, to wonder if there's anything to celebrate on Nigerian Independence Day.
'All companies related to the oil industry in the Niger Delta should prepare for an all-out onslaught,' said rebel spokesman Jomo Gbomo in a statement Saturday announcing an end to a three-month-old cease-fire.
Just hours after announcing a unilateral 60-day ceasefire with the government, the rebels threatened to end it.
Chevron has evacuated hundreds of employees from the oil-rich region of Nigeria after a string of attacks on oil pipelines.
A conflict could reduce Nigeria's oil output, affecting global oil supply.