COMO, Colo. (CBS4) – Campers have been evacuated, and at least one structure is threatened by a fire in Park County.

The 392 Fire is northeast of Como by nearly 10 miles.

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Fire engines, as well as a water tender and an ambulance, are being joined in the attack by helicopters and several air tankers.

(credit: CBS)

(credit: CBS)

The fire is estimated at approximately 90 acres in size, with 50 percent containment. It is burning in mixed conifers and grass. The fire’s behavior is described as moderate, “with creeping and single tree torching in grass and timber.”

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(credit: CBS)

Park County Road 39 is closed at both ends, from Park County Road 56 to Highway 285.

One home is currently evacuated, as well as up to 30 campers from area sites.

(credit: CBS)

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The cause of the fire is under investigation, but it is believed to be human-caused. Several families in the area tell CBS4 that it may have started from explosives used in gun shooting practice.