It said that by using live ammunition against unarmed protesters, "the army has broken the very same rule of law that they should protect".
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The African Union Election Observation Mission to Zimbabwe led by Hailemariam Desalegn Boshe, former prime minister of Ethiopia also commended the improved legal framework under which the elections were held.
The streets were calm on Thursday morning although many shops were shuttered in the city center.
"I wasn't sure whether it's safe to come to work".
"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".
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Mnangagwa previously said the opposition was to blame for the violence, though some worldwide observers criticized the military for opening fire on unarmed civilians.
President Emmerson Mnangagwa has said he is in communication with MDC Alliance Presidential candidate, Nelson Chamisa to diffuse the volatile situation in the country saying the dialogue is important to maintain peace in the country.
With nearly three-quarters of results from the legislative vote tallied, President Emmerson Mnangagwa's Zimbabwe African National Union-Patriotic Front had won 110 of the 210 directly elected seats in the National Assembly, electoral commission officials said in the capital, Harare, on Wednesday.
Watching the results trickling in from the Zimbabwe Electoral Commission (Zec) in the early hours, it became apparent that the ruling Zanu-PF would have a majority in parliament.
The military deployment was the first time that soldiers had appeared in the streets of the capital since Mugabe's departure in November.
The correct position is that Zanu PF won 145 and MDC Alliance 63.
The violence appeared to dash the hopes of Zimbabweans that the peaceful vote would lift them out of decades of economic and political stagnation under Mr Mugabe.
African observer groups said the vote was peaceful, orderly and largely in line with the law but raised concerns about bias of state media and the commission.
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"It is imperative that the results process is credible and transparent, with a full breakdown by polling station so that confidence in the outcome can be assured", Brok said.
Zimbabwe election violence: "People are desperate and angry".
So far, the ZEC has said that of 210 parliamentary seats, 205 had been counted with ZANU-PF winning 144 and the MDC Alliance 61.
Zimbabwean President Emmerson Mnangagwa says the government is surprised by violence that broke out after the announcement of National Assembly results.
"We have won this one together. No amount of results manipulation will alter your will", he tweeted before the army was deployed on Wednesday.
On the eve of the vote, Mugabe holds a surprise press conference at his home at which he stuns observers and calls for voters to reject the ZANU-PF, his former party.
But Chamisa, a lawyer and pastor, sought to tap into the youth and urban vote.
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