Zimbabwe's ruling party on Tuesday accused the army chief of "treasonable conduct" after he challenged President Robert Mugabe over the sacking of the vice president, in the latest sign of worsening instability in the country.
Mnangagwa's removal provides a boost for Grace Mugabe, the wife of the president, who is supported by the largely youthful G40 faction of ZANU-PF to succeed her husband.
This photo taken November 8, 2017, shows Zimbabwe's President Robert Mugabe, left, addressing party members and supporters to show support to Grace Mugabe, right, becoming the party's next vice president after the dismissal of Emerson Mnangagwa.
On Monday, top army general Constantino Chiwenga warned Mugabe that the military will "step in" if the president continues to expel former liberation fighters from the ruling Zanu-PF party who are supporters of the sacked vice president.
President Robert Mugabe's famous "blue house" or "blue roof" has been sealed off by heavily armed military personnel, Khuluma Afrika has confirmed.
Mugabe is yet to respond to Chiwenga's coup threats.
Earlier, BBC correspondents in the capital, Harare, reported that a few armoured vehicles have been seen on a main public road outside the city having left one of the country's main military barracks, Inkomo.
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"We must remind those behind the current treacherous shenanigans that, when it comes to matters of protecting our revolution, the military will not hesitate to step in".
Pictures of tanks heading towards the capital circulated on social media Tuesday prompting rumors that a coup could be imminent.
Speculation has been rife in Harare that Mugabe could seek to remove Chiwenga, who is seen as an ally of ousted Mnangagwa.
"We will not fold out hands to allow a creature of the constitution to subvert the very constitution which establishes it", said Kudzai Chipanga, who leads the Zanu-PF Youth League, said at the party's headquarters in Harare.
Chiwenga on Monday issued a hard hitting statement urging the ruling party to stop expulsion of party members with a liberation war background.
"Chiwenga threw down the gauntlet to Mugabe.it would make sense for Chiwenga to organise some military manoeuvres to up the ante".
Grace, now poised to become a vice president, did not fight in the liberation war.