The chairman of the Zimbabwe War Veterans Association Chris Mutsvangwa confirmed that Mugabe had been replaced by ex-vice-president Emmerson Mnangagwa as party leader, who had been fired by Mugabe this month, several media reports said.
Tens of thousands of Zimbabweans attended street protests on Saturday to demonstrate against the Mugabes.
The 93-year-old autocrat is yet to resign and was said to be "buying time" to negotiate an end to his 37-year-long reign.
Saturday's marches capped an unprecedented week in which army generals led by General Constantino Chiwenga seized power and placed Mugabe under house arrest. (ANI)