"I have set down (my) administration with institutions of higher learning, our universities to say we must now focus on producing products from universities and institutions of higher learning to say we must now produce products that fit in the industrialisation concept of this country", said President Mnangagwa.
It was not clear who was responsible for the explosion, which Mnangagwa called a cowardly act, or how the security around the president was breached.
"So far the number of people injured is 49 and they are now receiving treatment".
The explosive device, which appears to have been thrown detonated just as Mnangagwa and his entourage were alighting from the stage soon after addressing the campaign rally.
Mnangagwa escaped unhurt but several senior government officials were injured who include vice president Kembo Mohadi and ZANU-PF chairperson and cabinet minister Oppah Muchinguri.
State broadcaster ZBC described the blast as "an assassination attempt".
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Mnangagwa later pointed out he'd had numerous attempts on his life in the past, saying he was used to them by now.
The polls in five weeks will be the first since Zimbabwe's veteran leader Robert Mugabe resigned following a brief military takeover in November last year after 37 years in power. Unlike the past elections that were marked by killings, internal displacements, destruction of property and systematic intimidation of mainly opposition activists, this time around the country's politics had taken a somewhat mature route - allowing for all political actors to freely solicit for votes even in the so-called "no-go areas" without fear.
"We have no fatalities so far", said Parirenyatwa.
The US Embassy in Harare condemned the attack.
The main competition will be between Mnangagwa and the main opposition Movement for Democratic Change's leader, 40-year-old Nelson Chamisa. Any delays in bringing this matter to finality, as has been the case with other related attacks on the private media and opposition politicians, would cast aspersions on the State's commitment to breaking the cycle of violence.