Nigeria's parliament is to discuss a report said to reveal that $6bn (�4bn) has been defrauded from the fuel subsidy fund in the past two years.
The debate will be televised live - and make official findings that have been widely leaked in recent days.
The fuel sector probe was set up in the wake of angry nationwide protests in January after the government tried to remove a fuel subsidy.
Nigeria is a major oil producer but has to import most of its fuel.
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