Mahama urges the prompt release of presidential results from Monday's election, saying delays will increase speculation that results were manipulated.
He added: "The strategy is meant to prepare [Zimbabwe] mentally to accept fake presidential results".
Police patrol outside the Zimbabwe Electoral Commission offices as opposition supporters gather, in Harare, Zimbabwe, on August 1, 2018. "A lot of the protesters I've spoken to say, 'We don't need to see any more".
"Opposition parties have never enjoyed the freedom of meeting their supporters the way they have been doing‚ so they have perhaps misinterpreted our understanding to being weak‚" he said.
Races in some constituencies were so close that they could have gone to the opposition Movement for Democratic Change (MDC), had it not been split between Nelson Chinamasa's MDC Alliance and Thokozani Khupe's MDC-T.
Many Zimbabweans looked to the vote as a launching pad for a return to the kind of global acceptance and relative prosperity that the country enjoyed in the first part of the rule of Mugabe, who took office after independence from white minority rule in 1980.
This follows violence which erupted yesterday at the Harare International Convention Centre, where thousands of members from the opposition demonstrated to the Elections Command Centre as counting of the results was under way.
Though some results in local races have been announced, she said full and official results might not be announced until the weekend.
The electoral commission warned that final results of the presidential first round may not be known until Friday or even Saturday.
A Harare-based political analyst with Zimbabwe Democracy Institute, Pedzisai Ruhanya, said the results released so far could be a reflection of the will of the people but were not ideal. "If President Chamisa wins this election then the people of Zimbabwe will have their government." .
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ZEC Chairwoman Priscilla Chigumba said: "It depends with whether those who disagree with something would like to use legal remedies but sometime tomorrow we should be able to advise you what time we can, if any, start announcing the presidential election results".
The country's electoral commission said that Zanu-PF won a two-thirds majority in the national parliament - prompting protests in the capital, Harare.
Authorities invoked Zimbabwe's Public Order and Security Act, which allows police to ban public meetings or gatherings. "We have won this one together".
That omission gave room for the ZEC, which ZESN and the opposition have accused of bias, to manipulate the results in favour of Mnangagwa and the ruling ZANU-PF party, Biti said.
"You can't rig our election.this is a military government", the crowd shouted.
Parliamentary results show Zanu-PF heading for a big majority.
The ZEC has not announced the official results.
Chamisa, a lawyer and pastor, yesterday said results had not been posted outside 21% of the country's almost 11,000 polling stations, raising concerns about possible vote-rigging.
MDC Alliance's Tendai Biti said there was a clear attempt by Zanu-PF to interfere "with the people's will".