The smoke generated Creating by the fires Catastrophe was blown Motion into the Prairie Provinces and created Creating a moderate health risk Catastrophe there leading Causation Environment Canada to declare Expressing_publicly an air quality advisory Warning for southern Saskatchewan and Manitoba on 9 July .

Areas along the Bow , Elbow , Highwood , Red Deer , Sheep , Little Bow , and South Saskatchewan rivers and their tributaries were particularly affected Influence .

They began Process_start with the murders Killing of Benito Constable William Wainwright and RCMP Constable John Shaw near Pelly , Saskatchewan by three Doukhobor men who had been in the custody of the officers .