VIDEO: Phoenix brush fire produces 'fire whirl'

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The Daisy Mountain Fire Department captured video on Thursday of a dangerous phenomenon known as a "fire whirl."

The video was posted on the Department's Facebook page with this caption: "High winds, excessive heat, and low humidity are a recipe for disaster during wildfire season."

[RELATED: Brush fire contained near I-17 and Loop 303 contained]

Authorities say the brush fire near Interstate 17 and the Loop 303 has now been contained after charring 4 square miles in far north Phoenix.

It's still unclear how the fire started about 12:45 p.m. Thursday along the Loop 303 freeway and quickly grew.

The fire eventually closed an 11-mile stretch of Interstate 17 in both directions for hours due to thick, black smoke.

[RAW VIDEO: Phoenix brush fire produces 'fire whirl']

No homes or buildings were threatened by the second-alarm brush fire, however.

Phoenix Fire Department officials say more than 75 firefighters from surrounding cities helped control the blaze.

There were no reported injuries.

[SPECIAL SECTION: Arizona wildfires]

The Associated Press contriburted 

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