Firefighters were ambushed by a gunman while responding to a brush fire in Coeur d'Alene, Idaho, on Sunday, according to the local sheriff's office.

Wess Roley, 20, was found dead with a gun nearly six hours after the attack, and investigators say he acted alone, according to the Associated Press.

The identities of the two Idaho firefighters killed by a sniper in a horror ambush have been released. Kootenai County Fire and Rescue Chief Frank Harwood, 42, and Coeur d’Alene Fire Department Battalion Chief John Morrison,