A school girl in Zimbabwe was recently killed in a road accident which involved a US diplomat. Ruvarashe Takamhanya’s family are calling for the person involved to apologise to them in person. The US diplomat has now left Zimbabwe, and is back in the US.

Danai Nesta Kupemba, a BBC Africa journalist, has spoken to the family. She talks us through the case.

All diplomats have diplomatic immunity, which means they are protected from being arrested or prosecuted for alleged crimes. Alex Rhodes from the What in the World team explains why diplomatic immunity exists and who gets it. We also discuss prominent cases where diplomacy has been key - including with Julian Assange.

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