Fires across the Los Angeles area have killed at least 24 people and destroyed more than 12,000 structures, officials said, scorching more than 60 square miles and displacing tens of thousands of people.

Additional water tankers and scores of firefighters arrived at the Los Angeles area on Monday ahead of fierce winds that were forecast to return and threaten the progress made so far on two massive infernos that have destroyed thousands of homes and killed at least 24 people.

A growing force of firefighters battled massive infernos across the Los Angeles area on Monday as more powerful winds moved in and threatened recent progress against wildfires that have destroyed thousands of homes and killed at least 24 people.

Extreme fire conditions remain in the Southern California region as high winds have prompted a "Particularly Dangerous Situation" red flag warning,​ weather officials say.