On June 30, 2013, 19 firefighters from the Granite Mountain Hotshots were killed battling a wildfire near Yarnell, Arizona. Huge questions remain about the last moments of their lives. Why did they move out of a safe area in their final minutes of life? Why did the fire move so quickly? Could their deaths have been prevented?
The tragedy also raises a crucial environmental issue: Has the very act of fighting wildfires made our forests more dangerous?
Weather.com investigates in this origin