Atiku Abubakar, endorsed the pact drafted by the National Peace Committee during a ceremony at the Kukah Centre, Abuja on Wednesday.
Following his absence on Tuesday when President Muhammadu Buhari and some other candidates appended their signatures, Atiku and the PDP explained that it was caused by a communication lapse between them and the National Peace Committee, headed by General Abdulsalami Abubakar, a former Nigerian military ruler.
Atiku Abubakar was accompanied to the ceremony by Uche Secondus, the PDP Chairman and other party topshots.
He endorsed the accord at 12:08 p.m in the presence of Abdulsalami Abubakar and some European Union delegates