Another was shot and wounded by police.
This photo taken on January 7, 2017 shows Zimbabwe's then acting President Emmerson Mnangagwa speaking during a funeral ceremony in Harare.
The general election follows the ousting of long time Zimbabwean leader, Robert Mugabe in November a year ago by the military.
Correspondents stress that Wednesday's violence is confined to the centre of Harare - an opposition stronghold - while other parts of the country remain calm. This development has been necessitated by the fact that the degree of disturbances of law and order have reached a magnitude where our regular police officers, as well as our reserve members, have been unable to cope with this situation.
A wounded man takes shelter in a market stall in Harare as protests turned violent.
The ruling ZANU-PF party has won two thirds of the seats and will dominate the assembly - as they have done since the country's independence from Britain in 1980.
After the announcement, it will be critical to see if the Opposition parties will accept the results. This is exactly why we wanted change.
"They've rigged these elections".
With the rise of reactions in the angry crowd, the security officials brought reinforcement with one police truck and several water cannon trucks kept a watchful eye but did not interfere. "We further urge the Defence Forces of Zimbabwe to use restraint in dispersing protestors", the embassy said in a statement yesterday.
"I would like to ask for as fast as possible the release of the presidential election", he said.
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Mugabe's successor Emmerson Mnangagwa of the ruling ZANU-PF party and Nelson Chamisa of the opposition Movement for Democratic Change were the main contenders in Monday's election.
The EU did not understand why the release of the presidential result was taking so long, he said.
"The more the presidential vote is delayed, the more it calls into question the population's confidence in the election process", said former Liberian leader Ellen Johnson Sirleaf, the lead observer of a US monitoring mission. Otherwise, a run-off election will be held on 8 September.
European Union chief observer Elmar Brok said there were "efforts to undermine the free expression of the will of the electors through inducements, soft intimidation, pressure and coercion... to try to ensure a vote in favor of the ruling party".
"There is a deliberate delay in formally announcing results", he told a news conference, characterising it as "interference with the people's will". Zec has until Saturday to do so.
And authorities welcomed it as such, as well, inviting global election monitors to observe the elections for the first time in about 16 years.
The Comesa mission said the election was "peaceful, transparent and adhered to regional and worldwide standards".
Mnangagwa added that he blamed the leadership of the opposition MDC party for those who were killed and injured.
The regional SADC bloc, in its preliminary report, said Wednesday that the campaign and election had "proceeded in a peaceful and orderly manner and were largely in line" in Zimbabwean law.
What are the parties saying?
Chamisa, 40, said. He also accused the commission of announcing the parliamentary results first to "reverse the people's presidential election victory", and "prepare Zim [Zimbabwe] mentally to accept fake presidential results".