CRAIG, Colo. (CBS4) – The Peekaboo Fire in northwestern Colorado continues to grow. On Sunday afternoon it was 12,675 acres in size and only five percent contained.

It’s burning on burning in a remote, rugged area of federally owned land about 50 miles west of Craig in Moffat County.

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(credit: CBS)

The fire was sparked by lightning.

Smoke can be seen for miles, but there are no evacuation orders in place. Anyone in the area is warned to use caution.

(credit: CBS)

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Crews are building containment lines by hand to protect private property nearby. Three ranches, multiple structures, and the Browns Park National Wildlife Refuge are just a few miles south of the flames. Currently, no structures are threatened, but firefighters are monitoring and patrolling the area.

A Temporary Flight Restriction is in place for any aircraft not involved in firefighting operations, that includes drones.

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– See images from the most destructive wildfires (Black Forest, Waldo Canyon, High Park and Fourmile) and largest wildfire (Hayman) in Colorado history.