COLORADO SPRINGS, Colo. (CBS4) – Colorado Springs and El Paso County firefighters responded to a brush fire burning at the Air Force Academy Monday afternoon.

At around 5 p.m., academy officials said the fire was contained, and crews were working on hot spots. They say the fire was near the North Gate on Academy grounds. No buildings were threatened.

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Traffic leaving the base was told to leave through the South Gate, but one lane has opened at the North Gate. Parts of Santa Fe Trail are still closed.

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It’s unclear how the fire started.