BOULDER, Colo. (AP/CBS4) – A grass fire that ignited on Flagstaff Mountain in western Boulder has been contained.

It’s not clear if any houses were threatened.

The fire was reported Tuesday afternoon.

City firefighters and Boulder County sheriff’s deputies responded to the fire.

Flagstaff Road was closed to help firefighters reach the scene but has since reopened.

The cause of the fire hasn’t been released.

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