Controversially, the special fraud office is also hunting down the debtors.
Last week the central bank governor shamed some of the wealthiest people in Africa by naming them for not paying back massive loans.
Anti-fraud officials say some of the money has been returned, but huge amounts remain outstanding.
The deadline for repayment expires at midnight on Tuesday (2300 GMT).
Many legal experts say that debt is a civil matter and that the terms of the original loans still apply. They have questioned the legal basis of any further arrests.
Conspiracy charges
But the chief of the special fraud police Farida Waziri insists that there is a case.
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