With three seats yet to be declared in the parliamentary contest, ZANU-PF had 144 seats compared to 61 for the MDC, meaning the ruling party achieved the two-thirds majority that permits it to change the constitution at will.
UN Secretary General Antonio Guterres urged Zimbabwe's politicians to exercise restraint, while United Kingdom foreign office minister Harriett Baldwin said she was "deeply concerned" by the violence. "So I have yet to learn why they will be released last", he added, urging the electoral commission to release the results as fast as possible and for each individual polling station.
Zimbabwe's main opposition has said Mr Chamisa won the presidential election, sparking street celebrations by supporters on Tuesday. "They are stealing our election".
Police patrol outside the Zimbabwe Electoral Commission offices in Harare, Zimbabwe.
Many Zimbabweans looked to the vote as a launching pad for a return to the kind of worldwide acceptance and relative prosperity that the country enjoyed in the first part of the rule of Mugabe, who took office after independence from white minority rule in 1980. The 40-year-old vibrant leader says they have "won the popular vote".
Opposition MDC party supporters hold a voting placard up high during the clashes with police.
The opposition has spoken of vote-rigging, saying results were not posted outside a fifth of the country's almost 11,000 polling stations.
Though some results in local races have been announced, she said full and official results might not be announced until the weekend.
European Union observers on Wednesday listed several problems in Zimbabwe's presidential and parliamentary election, including media bias, voter intimidation and mistrust in the electoral commission. "So far, it shows that the people of Zimbabwe have entrusted ZANU-PF to lead them and we will do our best to meet the people's wishes in the constituencies that elected us, stated", Nick Mangwana, ZANU-PF spokesman stated.
Mr Mnangagwa's government, meanwhile, has accused Mr Chamisa and his supporters of inciting "violence" by already declaring he had won the election.
Pfigu said he was optimistic on election day for the country's first vote without Mugabe, who ruled for almost four decades, on the ballot.
Each polling station must post its results outside after vote-counting, she said.
The most important thing for us now is to move beyond yesterday's tragic events, and to move forward, together.I am therefore calling for an independent investigation into what occurred in Harare yesterday.
"Rocks were thrown into the compound of the ruling ZANU-PF party".
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