Troops have opened fire in Zimbabwe's capital Harare after opposition supporters went on the rampage.
At least one man was shot dead by the army, reports from the scene say. Another was shot and wounded by police.
The MDC Alliance alleges the ruling Zanu-PF party has rigged Monday's presidential and parliamentary vote.
Parliamentary results show the ruling Zanu-PF party heading for a big majority. The presidential result has yet to be declared.
European Union poll monitors have expressed concern over the length of time it is taking to declare the presidential result.
President Emmerson Mnangagwa has urged patience and calm following the first elections since long-serving ruler Robert Mugabe was ousted from power.
The MDC Alliance says its presidential candidate, Nelson Chamisa, won Monday's election.
Correspondents stress that Wednesday's violence is confined to the centre of Harare – an opposition stronghold – while other parts of the country remain calm. Latest reports from the capital suggest the security forces are in control of the streets.
Justice Minister Ziyambi Ziyambi said the army had been deployed in Harare to disperse a violent crowd and to restore “peace and tranquility”.
He added: “The presence of the army is not to intimidate people but to ensure that law and order is…
