Coniston massacre
The Coniston massacre, which took place near the Coniston cattle station in the then Territory of Central Australia (now the Northern Territory) from 14 August to 18 October 1928, 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.
Jallianwala Bagh massacre
On 13 March 1940, at Caxton Hall in London, Udham Singh, an Indian independence activist from Sunam who had witnessed the events in Amritsar and had himself been wounded, shot and killed Michael O'Dwyer, the Lieutenant-Governor of Punjab at the time of the massacre, who had approved Dyer's action and was believed to have been the main planner.