2 wildfires prompt evacuations near Boulder, Colo.

Two wind-driven wildfires swept across Boulder County grasslands Wednesday, prompting authorities to call for evacuations of threatened residential areas.

People living within a mile of each fire were told to leave, but it's not clear how many homes were involved.

One fire burned a house and a barn near the small town of Niwot, about 25 miles north of Denver. One of the buildings was destroyed but authorities did not know which.

No injuries were reported.

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