Two Catholic churches destroyed by fire on First Nations reserves in Canada

Blazes occurred on National Indigenous Peoples Day

Graves found at former Christian residential school last month

Two Catholic churches on First Nations reserves in western Canada have been destroyed by overnight fires that investigators are treating as suspicious.

Early Monday morning, fires consumed both the Sacred Heart church, on territory of the Penticton Indian Band and the St Gregory's church, on the territory of the Osoyoos Indian Band. Both churches, constructed largely of wood, were more than a century old.