Mutineering soldiers in Mali have detained President Ibrahim Boubacar Keita and Prime Minister Boubou Cisse.
“We can tell you that the president and the prime minister are under our control,” the leader, who requested anonymity, told AFP.
He added that the pair had been “arrested” at Keita’s residence in the capital Bamako.
Earlier, soldiers launched a mutiny from the nearby garrison town of Kati.
Another military official, who also declined to be named, said the president and prime minister were in an armoured vehicle en route to Kati.
The coup attempt began with gunfire inside a key military base, some 15km (nine miles) from the capital, Bamako, on Tuesday morning.
In the capital young men set a government-owned building on fire.
It comes hours after a mutiny in which senior military personnel were detained by disgruntled junior officers.
The mutiny has condemned by regional group Ecowas and former colonial power France.
The unrest coincides with calls for more protests to demand that the president resign.
Mr Keita won a second term in elections in 2018, but there is widespread anger over corruption, the mismanagement of the economy and the worsening security situation with jihadist and communal violence on the increase.
It is not yet clear how many soldiers have taken part in the mutiny. Some reports say it was fuelled by a pay dispute.
The Economic Community of West African States (Ecowas) however urged the mutineers to return to barracks.
“This mutiny comes at a time when, for several months now, Ecowas has been taking initiatives and conducting mediation efforts with all the Malian parties,” its statement said.