"We are however seriously concerned about evidence of interference. there is a deliberate delay in announcing the results".
ZEC chairperson Priscilla Chigumba told a press conference that some results were still trickling in from remote areas.
"The announcement of election results by unofficial sources has the potential to mislead the public and create unnecessary political emotions".
Zimbabweans desperately hope Monday's peaceful vote will lift them out of economic and political stagnation after decades of Robert Mugabe's rule, but the country is haunted by a history of electoral violence and manipulation that means trust is scarce, despite today's freer environment.
Chamisa said he had his own results from most of the almost 11,000 polling stations, saying he would wait for the official tally.
The Zimbabwe Electoral Commission has yet to release even preliminary results, but it has five days to release the final tally, and it says it is confident of doing so within that time frame.
At one polling station in the capital Harare, officials counted large piles of votes using gas lanterns and candles late into the night.
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A run-off vote is scheduled for September 8 if no presidential candidate wins at least 50 percent.
The commission said it would delay releasing any results of the presidential race until all the votes are collated.
Nearly 5.7 million registered to vote in the election that had 23 candidates vying for the presidency and 130 political parties running for Parliament and council.
July's elections mark the first time the European Union and United States election monitors have been allowed into the country in years. The peaceful election was a break from votes marred by violence.
NewsDay on Tuesday reported ZEC provincial elections officer Maxwell Ncube stated that out of 113 784 voters who cast their ballots by 11.30am, 1 725 were turned away, as they did not appear on the voters' roll. "Waiting patiently for official results as per the constitution", Mnangagwa, 75, Mugabe's former right-hand man, said on Twitter.
"My main concern is the (electoral commission), it obviously has a preferred party", he said.