Heavy rainfall has caused multiple mudslides in Baldwin Hills, Los Angeles, leaving several homes on the brink of collapse.
Rush hour traffic was also disrupted as cars were trapped in sludge.
In addition, a hillside collapsed into the ocean in Southern California, forcing a family to evacuate from their vacation rentals.
A state of emergency has been declared in Orange County, where four coastal apartment buildings have been red-tagged after a significant chunk of the San Clemente hillside gave way.
Geologists and inspectors have surveyed the site, and the buildings are said to be sound, but the ground below them continues to crumble.
The governor has added Orange County to the existing state of emergency to allow for aid to flow in more quickly.
With more rain on the way, the situation remains precarious for those living near the red-tagged sites.
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