What began as a routine response to a brush fire on northern Idaho’s Canfield Mountain turned into a deadly attack Sunday after firefighters reported someone shooting at them while they battled the flames.

Law enforcement is piecing together evidence of what happened in Idaho after officials say a man started a brush fire then ambushed first responders and killed two firefighters. The suspect was found dead after police were able to ping a cellphone to pinpoint his location.

Authorities say two firefighters were killed and another was badly injured after they were ambushed and shot while responding to a wildfire near Coeur d’Alene, Idaho.