A brush fire burned late Friday morning off the 57 Freeway in the San Dimas area.
The 13-acre fire was near Covina Boulevard, just off the freeway on a hillside. Traffic was backing up in the area as smoke drifted across the freeway.
Firefighters declared a knockdown at about noon. There was an initial threat to people in the Riverwood community area, but no structures were damaged.
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Fire crews are planning to remain at the scene throughout the night to monitor hot-spots.
Details regarding a cause were not immediately available.