Zimbabwe's main opposition leader warns that "there seems to be a deliberate attempt to suppress and frustrate the urban vote."
Nelson Chamisa has expressed his concerns on Twitter but declares that "Victory is ours!"
The vote in Zimbabwe's major cities is crucial to the opposition while rural areas traditionally back the ruling party. That can benefit President Emmerson Mnangagwa.
People in line when polls close at 19:00 can vote. The electoral commission says the turnout is high and voting has been peaceful, a contrast to the violence seen in past votes under former leader Robert Mugabe's 37-year rule.
This is the first election without Mugabe on the ballot.
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