Almost 200 years after a brutal attack on Aboriginal people, the descendants of those who were killed will receive an apology.

Western Australia governor Chris Dawson will deliver a formal apology for the actions of his predecessor, James Stirling, who led 25 men in a massacre against Bindjareb Noongar people in 1834.

Tuesday marks the 191st anniversary of the Pinjarra massacre, with official records saying about 20 Aboriginal people were killed at the site south of Perth.

Mr Dawson said the exact number may never be known, but Bindjareb Noongar people say the toll was higher than records suggested.

Initially described as the 'battle of Pinjarra', the Bindjareb Noongar people were faced with Mr Stirling's armed party, firing at them continuously for an hour.

Mr Dawson said Traditional

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