Along with Mamadou Tandja, the President of the National Movement for the Development of Society (MNSD-Nassara), and André Salifou, the President of the Union of Democratic and Progressive Patriots (UPDP-Chamoua), Assoumane was arrested on 17 April 1994 following a protest against the government.
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Assoumane was arrested in early January 1998, along with Hama Amadou and Mohamed Bazoum, for alleged involvement in a plot to assassinate Mainassara.