Topanga Canyon Boulevard, also known as State Route 27, was shut down in both directions Saturday between Pacific Coast Highway and Grand View Drive.
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Caltrans shared a video that shows mud and rocks flowing off the unstable hillside.
Crews are working to clear all the debris, but there's no word yet on how long it will take.
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Meanwhile, a portion of the Pacific Coast Highway in Malibu was also closed Monday due to a rockslide.