The military made its move after a power struggle over the successor for Mr Mugabe.
He sacked Vice-President Emmerson Mnangagwa last week, apparently to pave the way for Grace Mugabe, who is four decades younger than him, to take over the presidency.
Mr Mugabe’s nephew, Patrick Zhuwao, told Reuters news agency the couple were “ready to die for what is correct” and would not step down.
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