Armed troops in streets of Zimbabwe's capital

Armed troops are on the streets of Zimbabwe's capital to try to disperse hundreds of opposition protesters angry about alleged manipulation in the country's election.

Smoke is rising in Harare from burning vehicles. Trucks carrying security forces are circulating in the streets.

The opposition supporters had gathered outside the compound of the electoral commission and were met by riot police who fired tear gas.

Election observers from the European Union and United States are warning that presidential results should be released as soon as possible to avoid "volatility."

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