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Morgan Tsvangirai launches campaign with 'heavy heart'

8 July 2013 Last updated at 04:05 BST

Zimbabwe's Prime Minister Morgan Tsvangirai has launched his third campaign to unseat the veteran President Robert Mugabe.

The country is due to vote at the end of July but critics say crucial reforms have not been made to ensure a free and fair vote.

Catharina Moh reports.

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