The slide happened around noon at Little Dume Beach at the end of Cliffside Drive.
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AIR7 HD was over the scene, where a large pile of rocks on the beach was seen.
Officials say there's potential for more falling rocks and the cliff is "unstable." There are multi-million dollar homes along the cliff.
The city and county are inspecting the area to determine what to do next.
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It's unclear what caused the slide.