Tens of thousands of people were forced to flee their homes as a deadly brush fire in the Pacific Palisades grew to more than 20,000 acres this week and destroyed thousands of structures.

The Palisades fire can now be seen across Los Angeles' San Fernando Valley, an unsettling development as officials worried about the fire expanding into neighborhoods in Encino and Brentwood and possibly jumping the 405 freeway into Bel Air.

A number of videos have been shared on social media showing the Palisades fire, the most destructive in Los Angeles' history, making its way toward the populated San Fernando Valley with mandatory evacuation orders in place.

Tens of thousands of people were forced to flee their homes as a deadly brush fire in the Pacific Palisades grew to more than 20,000 acres this week and destroyed thousands of structures.

The Palisades fire grew to 21,596 acres overnight, with evacuations expanding rapidly in Encino and Brentwood as flames threatened homes in Mandeville Canyon. Six helicopters flew throughout the night,