The country's electoral commission said on Wednesday it would set the date for the release of the final results "sometime tomorrow".
He said: "SADC tell me, what you observing, what are you observing?"
Soldiers fired "randomly" and beat up bystanders who were not involved in the protests, said the Zimbabwe Human Rights NGO Forum.
Global observers who had initially given high praise for Zimbabwe's peaceful elections, issued more cautiously worded preliminary post-election results, alluding to some inconsistencies that could legitimize the opposition and its supporters' concerns.
More from Bloomberg.com: China Slams U.S.
Mnangagwa, a former deputy president who succeeded Mugabe after a military takeover in November, blamed the opposition for the violence and said it was "meant to disrupt the electoral process", the state broadcaster reported.
North Korea appears to be building one or two ICBMs
The U.S., he added , has "to know what they have before talking about caps and arms control". They believe North Korea is building at least one of its Hwasong-15 missiles there.
The United Nations and former colonial power Britain also expressed concern over the violence, and called for "restraint".
Zanu-PF's Secretary for Legal Affairs, Paul Mangwana, told reporters in Harare that should his party lose, they will walk away and re-strategize for the next election.
Thursday dawned very differently in Harare, as the military kept the streets clear and shops were ordered shut.
It alleges that the governing Zanu-PF party has rigged Monday's elections.
"The opposition. have perhaps interpreted our understanding to be weak, and I think they are testing our resolve and I think they are making a big mistake", he said.
The MDC said the army had opened fire on Wednesday 'for no apparent reason, ' killing unarmed civilians.
Tendai Biti, a candidate for opposition party Movement for Democratic Change (MDC), has accused the ruling Zanu-PF regime of plotting to assassinate himself and Chamisa.
Trump says China is targeting United States farmers, being ‘vicious’
Those affected economies have in turn targeted US agricultural products, including soybeans, dairy, meat, produce and liquor. The biggest exporter of American-made cars is a German company - BMW, through its plant in Spartanburg, South Carolina.
Protests and subsequent deaths in the capital Harare are the aftermath of vote rigging claims against the Zimbabwe Electoral Commission (ZEC), raised by the opposition Movement for Democratic Change (MDC) Alliance, and sentiments by some global observers that the poll was flawed.
Meanwhile, officials from the electoral commission were read the results from the parliamentary contest in a stuffy meeting room in the Rainbow Hotel.
On June 23 a bomb explodes as Mnangagwa leaves the podium at a ZANU-PF campaign rally in the opposition stronghold city of Bulawayo.
Mnangagwa had promised a free and fair vote after the military ushered him to power with a credible vote meant to end Zimbabwe's worldwide isolation and attract foreign investment to revive the shattered economy. Also in attendance were Commissioners from the National Electoral Commission of Zimbabwe, Heads and representatives of Diplomatic Missions in Harare, representatives of political parties, faith-based groups, members of the public, members of civil society, and the media fraternity. Final results must be released by August 4.
In a series of posts on Twitter, President Emmerson Mnangagwa said "we have been in communication" with challenger Nelson Chamisa and that "we must maintain this dialogue in order to protect the peace we hold dear".
Under Mugabe, elections were marred by fraud and often deadly violence, with the European Union mission banned since 2002.
Nawaz Sharif's party says army's 'pre-poll rigging' benefits Imran Khan
He is the brother of former Nawaz Sharif who was ousted over corruption allegations and is now serving a 10-year jail term. Violence gripped Pakistan on election day after several election-related incidents, including the suicide blast in Quetta.