Two firefighters were shot dead and a third wounded on an Idaho mountain when they were ambushed by a man who set the fire to lure them to the area, the local sheriff says.

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.

Wess Roley is suspected of killing two firefighters and wounding a third in Idaho, Kootenai County Sheriff Robert Norris said Monday.