The 19 men who died during an erratic wildfire are being remembered with a moment of silence and bell-ringing to mark the moment of their deaths exactly one year ago.

Bells chimed 19 times at 4:42 p.m. local time outside a historic courthouse in Prescott, home to the Granite Mountain Hotshots.

Prescott Fire Department Battalion Chief told the crowd that the "small community was forever changed" one year ago. he said, "The unimaginable suddenly had to be imagined."

The tragedy marked the largest loss of life for U.S. firefighters since the Sept. 11 terrorist attacks, and the worst for a wildland fire crew in eight decades.