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FILE - Oil installations at the Dangote refinery during the opening ceremony in Lagos, Nigeria, Monday, May 22, 2023. Nigerian legislators on Monday began a probe into the allegations of the importation of contaminated fuel into the country, as part of moves to resolve wider issues causing a rift between an oil refinery owned by Africa’s richest man Aliko Dangote and the industry regulator. (AP Photo/Sunday Alamba, File)

FILE - Oil installations at the Dangote refinery during the opening ceremony in Lagos, Nigeria, Monday, May 22, 2023. Nigerian legislators on Monday began a probe into the allegations of the importation of contaminated fuel into the country, as part of moves to resolve wider issues causing a rift between an oil refinery owned by Africa’s richest man Aliko Dangote and the industry regulator. (AP Photo/Sunday Alamba, File)

FILE - Aliko Dangote, Africa's wealthiest man, smiles during the opening ceremony of Africa's biggest oil refinery in Lagos, Nigeria, Monday, May 22, 2023. Nigerian legislators on Monday, July 22, 2024, began a probe into the allegations of the importation of contaminated fuel into the country, as part of moves to resolve wider issues causing a rift between an oil refinery owned by Dangote and the industry regulator. (AP Photo/Sunday Alamba, File)

FILE - Aliko Dangote, Africa's wealthiest man, smiles during the opening ceremony of Africa's biggest oil refinery in Lagos, Nigeria, Monday, May 22, 2023. Nigerian legislators on Monday, July 22, 2024, began a probe into the allegations of the importation of contaminated fuel into the country, as part of moves to resolve wider issues causing a rift between an oil refinery owned by Dangote and the industry regulator. (AP Photo/Sunday Alamba, File)