Ireportnews reported on Tuesday that Malian soldiers had arrested Keita and Prime Minister Boubou Cisse.
Following his arrest, President Ibrahim had announced his resignation and dissolution of his cabinet.
Soldiers, earlier on Tuesday rounded up senior government and military officers in Kati town and elsewhere.
Reacting, Sani in a tweet wrote: “Whenever we say coup is outdated then we see it updated.”
However, the Head of United Nations, UN, Antonio Guterres had demanded an immediate release of Boubacar, Malian Prime Minister and the other government official arrested and detained by the mutiny soldiers.