A BBC investigation has found evidence suggesting some results from Nigeria’s presidential election may have been manipulated.
The winner Bola Tinubu is due to be inaugurated on 29 May but the opposition is challenging this.
The BBC has uncovered significant anomalies in Rivers state, a key battleground, although not sufficient to change the overall national outcome of the election, which took place in February.
There are also questions over the identity of an election official who read out some of the unexplained results.
Oyigbo election official, Dr Dickson Ariaga, announced his name and that he worked for the Federal College of Education in Omoku.
On the recording, the word “Omoku” is indistinct, but there is only one Federal College of Education in Rivers state.
Dr Ariaga then read out the results for each party in alphabetical order, including for all the smaller parties.
They all matched those on the collation sheet the BBC had obtained. But when he reached Mr Tinubu’s APC, instead of saying 2,731 as written on our photograph of the sheet, he read out “16,630”.
Then for Mr Obi’s party (LP) the figure changed again – instead of the 22,289 seen on the sheet, he announced “10,784”, more than halving his vote.
The mystery surrounding Dickson Ariaga
We asked the electoral commission if we could speak to Dr Ariaga, but they would not give us his details or reach out to him for us.
We spoke to the election official seated next to Dr Ariaga, but she told us she wasn’t authorised to talk to the press.
So we sent a reporter to the Federal College of Education in Omoku, about two hours drive north of Port Harcourt, where he’d said he worked when introducing himself.
The Deputy Provost Moses Ekpa told the BBC: “From our records, both from our payroll and from our human resources, there is no such a name in our system and we don’t know such a person.”
Moses Ekpa says the Federal College of Education in Omoku has never heard of Dr Ariaga
We tried tracking him down on social media and eventually came across another Facebook account for someone in Port Harcourt, whose profile details had the name Dickson Ariaga.
When we compared an image from this account to the television pictures of Dr Ariaga using Amazon Rekognition software, we achieved a match of 97.2%, indicating a very high probability they’re the same man.
Dr Ariaga did not respond to messages sent by us to this account.