A BBC investigation has found evidence that Sudanese paramilitary fighters systematically destroyed el-Fasher's healthcare system during their long siege and subsequent takeover of the city in Darfur a year ago. BBC Africa correspondent Barbara Plett Usher explains.

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This is President Peter Mutharika's fifth visit to South Africa this year.

Questions about the integrity of some of Abramovich's professional advisers, were raised earlier this month.