Nigeria’s opposition Labour Party is to mount a legal challenge against the presidential election victory of Bola Tinubu of the governing APC.
The Labour Party’s Peter Obi came third in Saturday’s vote.
The opposition says the results were rigged; it is calling for fresh polls.
Just 28% of eligible Nigerian voters took part. Some could not cast their ballot because of malfunctioning machines.
Mr Tinubu won a 37% share of the votes, a lower margin of victory than previous Nigerian presidents.
European Union election observers said there had been significant shortcomings in the electoral process, adding there had been vote-buying but it was too early to say how widespread this was.
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