West African bloc says the coup is likely to have a negative impact on peace and stability in the region.
Ecowas said it had been mediating for more than two months in order to find a solution to the political crisis in Mali.
Ecowas reminded the military of its responsibility for the safety and security of Mr Kéita and other arrested officials.
The Economic Community of West African States (Ecowas) has rejected the military coup in Mali and ordered sanctions against its ringleaders.
The bloc of 15 West African countries condemned the mutiny within the Mali's armed forces that led to seizure of power and ouster of President Ibrahim Boubacar Kéita.
