Sheriff says cause of Black Forest Fire, Colorado's most destructive, might never be known

FILE - This June 2013 file photo shows a firefighter working the fire line on the Black Forest wildfire north of Colorado Springs, Colo. Sheriff Terry Maketa is set to release an after-action report on the Black Forest Fire Tuesday morning, June 10, 2014,. The fire started a year ago this week. It destroyed nearly 500 houses and killed two people north of Colorado Springs. (AP Photo/Brennan Linsley, FILE) (The Associated Press)

FILE - In this June 2013 file photo, firefighter Brandie Smith from Salida, Colo., walks past a burned out structure at the Black Forest wildfire north of Colorado Springs, Colo. Sheriff Terry Maketa is set to release an after-action report on the Black Forest Fire Tuesday morning, June 10, 2014,. The fire started a year ago this week. It destroyed nearly 500 houses and killed two people north of Colorado Springs. (AP Photo/Ed Andrieski, File) (The Associated Press)

Investigators have narrowed down where the Black Forest Fire broke out, but El Paso County Sheriff Terry Maketa (mah-KEE'-tah) says they might never know for sure how Colorado's most destructive fire started.

Maketa did not reveal the location during a briefing Tuesday on his office's "after-action" report. He says smoking, a campfire and a train have all been ruled out as fire starters.

Once the U.S. Forest Service finalizes its report on the fire, Maketa says his office's findings will be turned over to prosecutors to determine if criminal charges are warranted.

Investigators previously said the fire was human-caused, but Maketa has said there is no evidence it was intentionally set.

The Black Forest Fire started a year ago this week. It destroyed nearly 500 houses and killed two people north of Colorado Springs.