The deaths of 19 Hotshots in Arizona comes just before the anniversary of a similar tragedy in Colorado.
On July 6, 1994, 14 firefighters were killed when they were trapped fighting a fire that blew up just west of Glenwood Springs on Storm King Mountain.
A 50-acre fire erupted into a 2,000-acre firestorm and raced up a hillside. Some firefighters tried to outrun it while others wrapped themselves in fireproof shelters.
Nine of the victims were members of a Prineville, Ore.-based Hotshot team.
An Occupational Health and Safety Administration investigation blamed the disaster on a "management failure." The Bureau of Land Management reorganized its fire program as a result.
Fourteen marble crosses bearing the firefighters' names now stand on the mountain at the end of a hiking trail.