Muhammadu Buhari has in the meantime alleged that the bomb blast was an assassination attempt.
General Buhari in a statement personally signed by him said he was the target of the bomber. 
He said the suicide bomber on a fast moving vehicle made several attempts to overtake his security vehicle, but was blocked by his escort vehicle.
The former Head of State said the three vehicles in his convoy were destroyed, adding that his three aides who sustained injuries have been treated and discharged.