The leader of Zimbabwe's opposition party, the Movement for Democratic Change (MDC), Nelson Chamisa Friday rejected the outcome of the country's presidential election declared by the Zimbabwe Electoral Commission (ZEC).

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Calling the declaration of his opponent Mnangagwa as the duly elected president a black day for democracy, Mr Chamisa accused the electoral commission of being in cahoots with the state.

"Today is a black day for democracy... What is more disturbing is the electoral shenanigans. The manipulation and tampering of the will of the people is something that we do not take lightly. I won the presidency and Mr Mnangagwa was declared president by ZEC,"  Mr Chamisa said.

The MDC had claimed victory ahead of tallying of results and warned about rigging and doctoring of the results.

Law enforcement officers were engaged in running battles with opposition protesters in which six people were reportedly shot dead.

Chamisa announced that he will be challenging the outcome in court.

Events in the country appear to be following an all-too-familiar script seen in Kenya after opposition leader Raila Odinga suffered defeat in the presidential election and accused the electoral commission of rigging and doctoring results.

Odinga is a friend of the MDC.