In pictures: Wildfires devastate southern CaliforniaPublished9 December 2017Shareclose panelShare pageCopy linkAbout sharingImage source, Getty ImagesImage caption, California is entering its sixth day battling dangerous wildfires. They have been driven by extreme weather conditions: low humidity, high winds and parched ground.Image source, Getty ImagesImage caption, Authorities issued a purple alert - the highest level warning - amid what it called "extremely critical fire weather". Fanned by high winds, six large fires, and other smaller blazes, swept through tens of thousands of acres in a matter of hours.Image source, EPAImage caption, About 5,700 firefighters have been battling the fires, with many drafted in from neighbouring states to help. The Thomas fire in Ventura County is the largest, and has destroyed more than 430 buildings.Image source, EPAImage caption, Nearly 200,000 residents were evacuated from their homes, with many forced to flee in the middle of the night as the flames rapidly spread.Image source, AFPImage caption, Three firefighters have been injured and hundreds of buildings destroyed. One death was reported after a 70-year-old woman was found dead in her car on an evacuation route.Image source, NASA/EPAImage caption, Satellite imagery shows the vast Thomas Fire, north of Los Angeles, which has spread as far as the Pacific coast. US President Donald Trump issued a state of emergency in response to the fires.Image source, Getty ImagesImage caption, There are fears the blaze will hurt California's vast agricultural industry. Much of the state's avocado crop has been destroyed. About 90% of US avocados are grown in California and the industry is worth millions to the economy.Image source, AFPImage caption, The fires have destroyed homes and scorched residential areas. In the wealthy Los Angeles enclave of Bel Air, firefighters were seen removing belongings from luxury homes as the flames spread.Image source, Getty ImagesImage caption, Several evacuation orders were lifted on Friday afternoon, leaving residents free to return home and assess the damage.More on this storyResidents flee as California fires spreadPublished8 December 2017California wildfires: Flames seen from spacePublished8 December 2017Wildfires surround LA freeway. Video, 00:00:43Wildfires surround LA freewayPublished6 December 20170:43