Spokesman of the auditor's office, Gabriel Martin said the corruption probe revealed hundreds of cases of fraud through inflated government contracts and fake orders with Tandja and over two thousand people implicated.

"Some of these people have come forward to admit their responsibility, and others have not. The cases have been forwarded to the appropriate authorities," Reuters quoted Martin as saying.

Martin added that Tandja was involved in many of the corruption cases and the military junta has said the former President would likely be prosecuted.

Tandja is said to have been under house arrest in the capital Niamey since the February coup.