Zimbabwe's election campaign season took a worrying turn when a crude bombing at a speech delivered by President Emmerson Mnangagwa appeared to be an attempt on his life. "He is at state house in Bulawayo", said Mnangagwa's spokesman George Charamba.
Bulawayo police are already investigating the attempt on the president's life.
The area around the stage was immediately cordoned off with explosives experts collecting evidence.
Mnangagwa suggested he was the target of the attack, which he said also injured Vice-President Kemo Mohadi.
Reports published by Zimbabwe Today, claims two presidential aides died on spot while several others were injured.
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The country's environment minister, deputy speaker of parliament and several security personnel were also among the injured. He added: "I can assure you these are my normal enemies".
The US Embassy said "political violence in any form is unacceptable" and contrary to the progress needed to move Zimbabwe forward to 'take its place on the global stage'. While we await further information, my thoughts and prayers are with all those affected by this senseless act of violence.
"I am used to these attempts", Mnangagwa said in his first comments on the explosion.
Injured people are evacuated after an explosion at the stadium in Bulawayo where Zimbabwe President just addressed a rally.
The upcoming elections are the first to be held without former president Robert Mugabe since the country's independence in 1980.
American officials have said a credible vote is the only way global sanctions can be lifted.