China, Zimbabwe’s biggest trading partner, says it is closely watching the situation and hopes that the relevant parties can properly handle their internal affairs.
How did the military justify its move?
Troops in armoured vehicles have been out in the streets of the capital Harare since Tuesday.
After soldiers overran the headquarters of the ZBC broadcaster, Maj Gen Sibusiso Moyo went on air to say the military wished to “assure the nation that his Excellency the president… and his family are safe and sound and their security is guaranteed”.
“We are only targeting criminals around him who are committing crimes… that are causing social and economic suffering in the country,” he said.
“As soon as we have accomplished our mission, we expect that the situation will return to normalcy.”
Other key points of the statement include:
Citizens should remain calm and limit unnecessary movement
The military assures the Zimbabwean judiciary that its independence is guaranteed
Security services should “co-operate for the good of our country” and any provocation would “be met with an appropriate response”
All leave for the defence forces is cancelled and personnel should return to barracks immediately
It is not clear who is leading the military action.
Army chief Gen Constantino Chiwenga, who visited China last week, said on Monday the army was prepared to act to end purges within Zanu-PF.
The old guard strikes back
By Joseph Winter, BBC News website Africa editor
This is all about the leadership succession, as Mr Mugabe’s powers finally falter.
The people who fought in the 1970s guerrilla war against white minority rule still dominate Zimbabwe’s government and especially its security forces, and they are worried about losing that power and the wealth it generates.
In his statement on Monday, Gen Chiwenga warned against the “purging, which is clearly targeting members of the party with a liberation background”.
This was obviously a reference to the sacking last week of Mr Mugabe’s once loyal deputy, Mr Mnangagwa, a former defence minister, spy chief and veteran of the war of independence.
He and Grace Mugabe, who is four decades younger than her husband, had been seen as the main candidates to succeed Mr Mugabe. Mrs Mugabe’s supporters are known as Generation 40 or G40 – a name which signals a changing of the guard in Zimbabwe, at least partially, 37 years after independence.
So this military action is the old guard reasserting its authority. Mr Mugabe was the political leader of the guerrilla war so the army always professed loyalty to him until he explicitly came out in favour of his wife.
The firing was coming from northern suburbs where Mr Mugabe and a number of government officials live, the BBC’s Shingai Nyoka reports from Harare.
A witness told AFP news agency it could be heard near Mr Mugabe’s residence in the suburb of Borrowdale early on Wednesday,
Some staff at ZBC were manhandled when the soldiers moved in, sources told Reuters.
Has anyone been detained?
A government source told Reuters news agency that Finance Minister Ignatius Chombo had been detained.
He is a leading member of a faction of Zanu-PF led by Grace Mugabe.
Is this a coup?
Alex Magaisa, former adviser to Zimbabwean opposition leader Morgan Tsvangirai, told the BBC: “They have decided not to call it a coup because they know that a coup does not sell, it will be condemned.
“But as far as authority is concerned it seems very clear that President Mugabe is now just a president in name and authority is now residing in the military.”
Zanu-PF had accused Gen Chiwenga of “treasonable conduct” after he issued his warning that the army might intervene.
What was the political situation before the army acted?
Mr Mnangagwa had been seen as a potential heir to the president before he was sacked last week, leaving First Lady Grace Mugabe as the clear front-runner.