"Equally, we hold the party and its leadership responsible for any loss of life, injury or damage of property that arise from these acts of political violence which they have aided and abetted", he said.
Al Jazeera's Haru Mutasa reports from Harare.
Riot police using water cannon and tear gas arrived to a chaotic scene of burning tyres and an unrelenting crowd.
The Zimbabwe Electoral Commission results showed Mr Mnangagwa's ZANU-PF cruising to a big majority after picking up 109 seats against 41 for the opposition Movement for Democratic Change (MDC).
Mnangagwa also took to Twitter, calling for calm and urging patience before the results were announced.
Has promised to rebuild the country's devastated economy, but has been criticised for making extravagant promises - such as the introduction of a high-speed bullet train and bringing the Olympics to Zimbabwe.
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His release was eventually secured in May 2014 in exchange for the five Taleban prisoners, who are living in Doha. The Afghan president's office said Saturday that it welcomed any support for peace efforts.
The MDC also questioned the pace of releasing results from the presidential vote.
While the electoral commission has five days from the end of voting to release the final tally, the national mood was growing anxious partly because unofficial results are already swirling on social media.
The EU's assessment is critical in determining whether Zimbabwe can fix its image and attract the foreign investors needed for an economic revival.
It suggested there was a deliberate effort to delay announcing the results, reflecting deep suspicion about the panel presiding over the election.
Hundreds of supporters of Zimbabwe's main opposition party, the MDC, gathered outside a Harare hotel today, where election results were being announced. The commission said two seats were won by smaller parties and 58 seats had yet to be declared.
Ballots are still being counted in the presidential election with results expected to be announced later this week. They believe the election has been stolen, and are demanding the MDC be announced as victor.
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A 32-year-old man has been arrested and charged with 15 arson counts, though it is still unclear if he started the Carr fire . Thursday night CAL FIRE reported the fire had burned 28,000 acres. "The Carr fire, at times, experienced all three combined".
The vote attracted a high turnout of 70% and was monitored by worldwide observers.
Mugabe, 94, voted in Harare alongside his wife Grace after he stunned observers by calling for voters to reject ZANU-PF, his former party.
"The longer it lasts that the results of the presidential election is not known, the more lack of credibility it provides", Brok said.
"We collated the results from our agents at all polling stations and what they reflected is nothing else except victory for MDC Alliance presidential candidate Nelson Chamisa, and we demand that they make those V11 forms public".
"We have received a confidential report that (Vice President and retired Army) General Chiwenga has ordered the assassination of Nelson Chamisa and myself".
The EU mission pointed out the "misuse of state resources, instances of coercion and intimidation, partisan behavior by traditional leaders and overt bias in state media" but says Monday's election was largely peaceful in a break from the past.
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But perhaps the highest-stakes denial was given by Trump Jr.in his testimony previous year to the Senate Judiciary Committee. At the time, the Russian operation to covertly boost Trump's candidacy wasn't publicly known. "It's not true", he said.
The opposition party won in most urban centres.