"The longer it (the delay in announcing the results of the presidential race), the more the issue of lack of credibility arises", European Union observer Elmar Brok said.
The parliamentary results strengthened the chances of President Emmerson Mnangagwa holding power, but triggered MDC demonstrations in Harare and fears of clashes between angry opposition supporters and the government.
Opposition leader Nelson Chamisa's Movement for Democratic Change (MDC) has accused President Emmerson Mnangagwa's Zanu-PF party and the Zimbabwe Electoral Commission of using underhand tactics to steal the election from them. "No amount of results manipulation will alter your WILL".
"The Zimbabwe Republic Police would like to confirm the unfortunate deaths of three people during the riots and melee which occurred in Harare Central business district", police spokeswoman Charity Charamba told state television.
The observers also flagged a misuse of state resources, including food aid, instances of intimidation and bias among traditional leaders and state media, which it said were all used to sway the election in favor of the ruling party.
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More than five million people were registered to vote - with a high turnout of 70%.
Ellen Johnson Sirleaf, former Liberian president and head of the observer mission of the International Republican Institute and the National Democratic Institute, warned "the more the presidential vote is delayed, the more it calls into question the population's confidence in the election process".
As results have yet to be officially announced by the ZEC sources counting the ballots have said it is "close".
Zimbabweans were desperately hoping the peaceful election held on Monday would lift them out of economic and political stagnation after decades of Robert Mugabe's rule.
MDC Alliance supporters demonstrate outside the Zanu-PF headquarters.
European Union observers questioned the conduct of the presidential and parliamentary poll, Zimbabwe's first since Robert Mugabe was forced to resign following a de facto coup in November after almost 40 years in power.
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The party's supporters today went on rampage, protesting against the results of Monday's harmonised elections which saw Zanu PF winning two thirds majority in parliament. "We won the popular vote [and] will defend it", Chamisa said.
She added that the United Kingdom was monitoring the situation closely and further advised British nationals in Harare to check the latest travel advisory issued by the Foreign and Commonwealth Office.
"The Zimbabwe Electoral Commission (ZEC) has announced a further 50 National Assembly results, bringing the total so far to 153".
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. His party says the election was rigged.
The ZANU-PF leader tweeted: "At this crucial time, I call on everyone to desist from provocative declarations and statements".
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