The Coniston massacre, which took place from 14 August to 18 October 1928 near the Coniston cattle station in Northern Territory, Australia, was the last known officially sanctioned massacre of Indigenous Australians and one of the last events of the Australian Frontier Wars. People of the Warlpiri, Anmatyerre, and Kaytetye groups were killed. The massacre occurred in revenge for the death of dingo hunter Frederick Brooks, killed by Aboriginal people in August 1928 at a place now known as Yukurru, also known as Brooks Soak. https://en.wikipedia.org/wiki/Coniston_massacre
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