A video circulating social media shows Mnangagwa walking off the stage, fists in the air, as he's accompanied by a small group of officials. "Investigations are underway, and the nation will be kept abreast of relevant developments", presidential spokesman George Charamba told the Sunday Mail.
People were seen ducking and screaming as smoke billowed through the stadium - with state television immediately cutting the broadcast.
Mnangagwa blames his usual enemies for the explosion, which has been described as a possible "assassination attempt" by state media but he has vowed under his leadership, the ruling Zanu-PF is assured of victory in the scheduled July poll.
Mnangagwa was addressing supporters ahead of the July elections, the first after the deposition of Robert Mugabe.
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Among Zimbabwe's small but vibrant Twitter and Facebook communities, people posted various theories, including accusations that this was an inside job meant to gain sympathy votes in an opposition stronghold.
Mnangagwa shortly after the attack told the state broadcaster, without elaborating, that those responsible must have come from "outside Bulawayo".
"The UAE condemns this cowardly act of terror, which seeks to undermine security and stability of Zimbabwe by resorting to violence", said a statement issued by the Ministry of Foreign Affairs and International Cooperation, on Saturday.
"Several people were affected by the blast, and I have already been to visit them in hospital". The strongest response to violence is peace.
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Chiwenga's wife was also hospitalized, but she has been treated and released, Charamba said.
Chiwenga is now one of Zimbabwe's two vice presidents.
Locally, the African National Congress (ANC) has condemned the detonation of the explosive device in Zimbabwe and the deadly blast that occurred at a rally in Addis Ababa, Ethiopia.
"Any form of violence in politics is unacceptable. May God bless and protect the country we all love". Mnangagwa, a longtime ally whose firing as Mugabe's deputy after a ruling party feud led to the transfer of power, is under pressure to deliver a credible election that western countries see as key to lifting global sanctions. Mnangagwa had speculated publicly in speeches this year that members of his own party were out to impeach him or worse.
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