Nigeria's Vice President Yemi Osinbajo has returned to Abuja after a brief and unexplained visit to President Muhammadu Buhari, who is on sick leave in London, his spokesman said on Twitter on Wednesday. The unannounced and brief trip has fuelled speculation over Buhari's illness, the details of which have not been made public, and whether he will be able to stand in the 2019 elections. Osinbajo's spokesman did not give a reason for the visit and declined to comment when asked.



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