The Black Forest Fire (CO) is now being called 100 percent contained, reports thedenverchannel.com.
Fire investigators spent the day searching a 28 by 28 foot area for the cause.
The fire burned 14,280 acres in Black Forest, north of Colorado Springs.
"They [investigators] have all but ruled out natural causes as the cause of this fire," said El Paso County Sheriff's Terry Maketa on Thursday.
"We are pretty confident it was not, for instance, a lightning strike."
Mekata also said the investigation into the point of origin has shrunk.
"I've referred to it as 40 x 40 foot area," Maketa said. "That has now shrunk down to a focus of about 28 square feet. Investigators are on their hands and knees with magnifying glasses, looking at everything there is on the grass, every needle, every sliver of wood."
Most of the Black Forest Fire evacuees were allowed to return home on Thursday morning.
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