Nigeria's Minister of Petroleum Resources Diezani Alison-Madueke speaks to journalists prior to the start of the meeting of the Organization of the Petroleum Exporting Countries, OPEC, at their headquarters in Vienna, Austria, Wednesday, Dec. 12, 2012 . (AP Photo/Ronald Zak)

Associated Press
Nigeria's Minister of Petroleum Resources Diezani Alison-Madueke speaks to journalists prior to the start of the meeting of the Organization of the Petroleum Exporting Countries, OPEC, at their headquarters in Vienna, Austria, Wednesday, Dec. 12, 2012 . (AP Photo/Ronald Zak)
Nigeria's Minister of Petroleum Resources Diezani Alison-Madueke speaks to journalists prior to the start of the meeting of the Organization of the Petroleum Exporting Countries, OPEC, at their headquarters in Vienna, Austria, Wednesday, Dec. 12, 2012 . (AP Photo/Ronald Zak)
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