Zimbabwe's opposition unites to challenge President Robert Mugabe

Zimbabwe's main opposition leader Morgan Tsvangirai has reunited with his former allies to agree a pre-election pact to challenge President Robert Mugabe's near four-decade hold on power at the polls next year. On Saturday, Welshman Ncube, who led a break-away MDC faction in 2004 and Tendai Biti, who left the main opposition in 2014, signed a pact that would see them fielding parliamentary candidates in some constituencies under the MDC Alliance banner and would support Tsvangirai's fourth bid for the presidency. Simon Muchemwa reports from Harare..