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There is no evidence that the diploma Nigeria's President Bola Ahmed Tinubu submitted to the country's electoral commission was forged, the BBC's Global Disinformation Team has found.

Allegations that President Tinubu's certificates were faked went viral on social media following the release by Chicago State University (CSU) of his academic records last week.

We have looked at some of the most widely circulated claims.

The release of the president's academic documents is the culmination of a judicial case filed in August by one of his main rivals in February's presidential election, Atiku Abubakar of the Peoples Democratic Party (PDP).

Mr Abubakar was hoping to have the victor disqualified after accusing him of falsifying the CSU diploma of Bachelor of Science in Business Administration awarded in 1979 that he submitted to the electoral authority (Inec).

To obtain evidence for his case in Nigeria, Mr Abubakar approached a US court in August, requesting it to compel CSU to release Mr Tinubu's academic records through a process called discovery, where the parties exchange information including documents ahead of a trial.

Mr Tinubu's lawyers opposed the discovery application, citing privacy concerns, but the US court decided it should proceed.

The documents requested by Mr Abubakar were:

A copy of any diploma issued by CSU in 1979

A copy of the diploma CSU gave to Mr Tinubu in 1979

Copies of diplomas with the same font, seal, signatures, and wording awarded to other students that are similar to what CSU awarded to Mr Tinubu in 1979

Documents from CSU that were certified by Jamar Orr, who was then a staff member of CSU, in the 12 months from 1 August 2022

In response to request one, CSU submitted seven diplomas covering different disciplines with the names of the students redacted. According to the university's registrar, these diplomas had not been collected by the students.

In response to request two, CSU stated that it could not find the diploma they issued to Mr Tinubu in 1979, because they do not keep copies of diplomas already collected by students.

In response to request three, CSU stated that it produced for Mr Tinubu a replacement diploma dated 27 June 1979. It also released diplomas awarded to other students that bore similar font, seal, signatures and wordings as Mr Tinubu's diplomas.

In response to request four, CSU submitted other academic documents initially attested to and released by Mr Orr.