Evacuations were ordered and classes canceled as crews battled a fast-moving wildfire near Boulder, Colorado, early Tuesday, authorities said.

"Approximately 3,000 residents are in the evacuation areas," Boulder's emergency management office said. "The Four Mile Canyon Fire is a wind-driven fire burning in steep, rocky, and hard to access terrain west and north of the City of Boulder."

No injuries were reported as 3,500 acres have burned in the blaze, being fought by 100 firefighters from 35 different agencies.

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