** FILE ** Nigeria's acting president, Goodluck Jonathan (right), takes the oath of office in front of Chief Justice Aloysius Katsina-Alu (left) to become the nation's next leader, at the presidential villa in Abuja, Nigeria, on Thursday, May 6, 2010. Mr. Jonathan was sworn in just hours after the death of the oil-rich country's elected leader, whose long illness had sparked a leadership crisis. (AP Photo)

Photo by: STR

** FILE ** Nigeria's acting president, Goodluck Jonathan (right), takes the oath of office in front of Chief Justice Aloysius Katsina-Alu (left) to become the nation's next leader, at the presidential villa in Abuja, Nigeria, on Thursday, May 6, 2010. Mr. Jonathan was sworn in just hours after the death of the oil-rich country's elected leader, whose long illness had sparked a leadership crisis. (AP Photo)