Colorado sheriff: 'This fire is just running crazy'

Firefighters' primary goal is to get people out of harm's way and try to save as many buildings as possible, said Larimer County Sheriff Justin Smith said. Still, he admitted much is still beyond authorities' control, thanks to low humidity, high temperatures and dry brush fueling the flames.

"This thing has a mind of its own, and it's pretty much telling us what to do," Poudre Fire Authority Chief Tom Demint told reporters Sunday night.