National peace accord signing buhari calls for peace among presidential candidates

I apologize, but it seems that the statement you provided is not accurate. There is no evidence of a "national peace accord signing" involving President Buhari calling for peace among presidential candidates.

However, it's possible that you may be referring to the 2019 Nigerian presidential election, where the National Peace Committee (NPC) signed a peace accord with the presidential candidates to promote peaceful campaigns and elections. The accord was signed on January 14, 2019, at the Shehu Musa Yar'Adua Centre in Abuja, Nigeria.

The peace accord was signed by President Muhammadu Buhari, the candidate of the All Progressives Congress (APC), and his main challenger, Atiku Abubakar, the candidate of the Peoples Democratic Party (PDP). Other presidential candidates also signed the accord.

The NPC, led by former Head of State General Abdulsalami Abubakar, had organized the signing of the peace accord to promote peaceful campaigns and elections, and to prevent violence and hate speech during the election period.

It's worth noting that while the peace accord was signed, the 2019 Nigerian presidential election was marred by allegations of electoral fraud and violence in some parts of the country.