He served as interior minister of the State of Comoros, (État Comorien), briefly during 1975 when Comoros gained independence,[1] but lost that post when Ali Soilih took power.
On May 13, 1978, Atthoumani helped lead a coup in which Soilih was overthrown.
Until 23 May 1978 Atthoumani headed the short-lived provisional government by leading a politico-military directorate which took charge of the State of Comoros.
After Atthoumani formally gave up power to them, they installed themselves as joint presidents, renaming the state as Federal and Islamic Republic of Comoros, (République Fédérale Islamique des Comores).
He was the nephew of Said Mohamed Jaffar, 10th and 11th Chairman of the National Executive Council of the Comoros from August 1975 to 3 January 1976.