Two firefighters were fatally shot and a third is seriously injured after investigators say a lone gunman opened fire on crews responding to a brush fire on Canfield Mountain Sunday, near Coeur d’ Alene, Idaho.

The now deceased suspect is believed to have started the fire intentionally to draw-in and target responding firefighters, officials have said.

Within an hour of being deployed, firefighters reported being shot at as the blaze continued to burn.

Various agencies, including the Spokane County Sheriff’s Office, Idaho State Police and Coeur d’Alene Police Department, were caught in an exchange of fire for about 90 minutes, according to Kootenai County Sheriff Robert Norris.

The two firefighters killed in the fray have been identified as Kootenai County Fire and Rescue Chief Frank Harwood and Coeur d’Alene Fire Department Battalion Chief John Morrison.