At least 13 people are dead amid "waist-deep" mudslides in Southern California, where heavy rains triggered flooding, say officials.
Some 163 people have been taken to hospital. Twenty had "storm-related injuries" and four were critically hurt.
A group of up to 300 people are reportedly trapped in Romero Canyon, east of Santa Barbara.
Police said the scene "looked like a World War One battlefield".
The flooding and mudslides, affecting areas scorched by wildfires last month, have shut down more than 30 miles (48km) of the main coastal highway.
Emergency services said a number of people are unaccounted for and they expect the death toll to rise.
Thousands fled the deluge and more than 50 rescues have been performed.
The hardest hit homes were those that were not in the evacuation zone, officials say.
— (@EliasonMike) Skip Twitter post by @EliasonMike ">
">https://twitter.com/EliasonMike/status/950790671216111618?ref_src=twsrc%5Etfw">January 9, 2018 — (@EliasonMike) January 9, 2018 ">#CAstorm- Firefighters successfully rescued a 14 yr old girl (right) after she was trapped for hours inside a destroyed home in Montecito. pic.twitter.com/1P239MLAZ5
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">https://twitter.com/EliasonMike/status/950790671216111618" class="off-screen" tabindex="-1">End of Twitter post by @EliasonMike— (@EliasonMike) End of Twitter post by @EliasonMike">Heavy rain run-off caused mudflow in the community of Montecito, where some homes were knocked from their foundations, said Santa Barbara County Fire Department spokesman Mike Eliason.
Boulders the size of small cars were rolling down hillsides and blocking roads, reports BBC News Los Angeles correspondent James Cook.
Among those taken to safety was a 14-year-old girl who had been trapped for hours in the ruins of her home.
The fire department published a picture of the girl encased in mud as she was led to safety.
— (@VCAirUnit) Skip Twitter post by @VCAirUnit ">
">https://twitter.com/VCAirUnit/status/950838547275169792?ref_src=twsrc%5Etfw">January 9, 2018 — (@VCAirUnit) January 9, 2018 ">View from the air in Montecito. Areas that had been roadways, driveways, and homes, are now unrecognizable due to the large amount of mud and debris flows. pic.twitter.com/dbsUPw3mrL
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">https://twitter.com/VCAirUnit/status/950838547275169792" class="off-screen" tabindex="-1">End of Twitter post by @VCAirUnit— (@VCAirUnit) End of Twitter post by @VCAirUnit">County Fire Captain Dave Zaniboni said that five people were found dead on Tuesday in Montecito and may have been killed as result of the storm.
The upmarket neighbourhood includes homes owned by celebrities such as actor Rob Lowe and chat show host Ellen DeGeneres.
Oprah Winfrey also has a property in Montecito that is reportedly worth nearly $90m (£66m).
— (@TheEllenShow) Skip Twitter post by @TheEllenShow ">
">https://twitter.com/TheEllenShow/status/950807626509574144?ref_src=twsrc%5Etfw">January 9, 2018 — (@TheEllenShow) January 9, 2018 ">This is not a river. This is the 101 freeway in my neighborhood right now. Montecito needs your love and support. pic.twitter.com/jRNCBrp4b5
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">https://twitter.com/TheEllenShow/status/950807626509574144" class="off-screen" tabindex="-1">End of Twitter post by @TheEllenShow— (@TheEllenShow) End of Twitter post by @TheEllenShow">The US Coast Guard has sent "multiple airships to support rescue operations" and warn the public not to fly drones, otherwise the flights will force to be grounded.
Wildfires in December, including the Thomas Fire, swept through the area burning vegetation that helps prevent flooding and landslides.
Thousands of California residents were asked to evacuate on Monday for the second time in two months.
In Burbank, where waves of mud swept away vehicles, officials issued a mandatory evacuation order.
— (@BurbankCA) Skip Twitter post by @BurbankCA ">
">https://twitter.com/BurbankCA/status/950831376760127488?ref_src=twsrc%5Etfw">January 9, 2018 — (@BurbankCA) January 9, 2018 ">Please see photos from the storm. If you witness significant mud, debris or fast flowing water, do not try to cross, or drive a vehicle through it and shelter in place. pic.twitter.com/RQNTHPc5z6
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">https://twitter.com/BurbankCA/status/950831376760127488" class="off-screen" tabindex="-1">End of Twitter post by @BurbankCA— (@BurbankCA) End of Twitter post by @BurbankCA">Homeowners in the area shared photos of mud in their homes.
Several roads are closed due to mudslides and debris, including the major thoroughfare Highway 101.
After a wildfire, burned vegetation and charred soil create a water repellent layer which blocks water absorption and leads to an increased risk of mudslides and floods.
"Recent burn areas will be especially vulnerable where dangerous mud and debris flows are possible," said the National Weather Service in a statement.
The Federal Emergency Management Agency shared a warning for California homeowners explaining that homes that had never flooded before were now at risk.
About 30,000 residents were under evacuation orders on Monday.
This comes after a record-setting year of $306bn (£226bn) of weather and climate-related disaster costs in the United States, the third warmest year on record, according to the US National Oceanic and Atmospheric Administration.
The storm over California is expected to produce 4 inches to 7 inches (10 to 18 cm) in the foothills and 9in (23cm) in select areas.
Snow is falling at higher elevations, according to the National Weather Service.
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">https://twitter.com/caffeineben/status/950711044921442304?ref_src=twsrc%5Etfw">January 9, 2018 — (@caffeineben) January 9, 2018 ">Flash flood / massive amounts of mud swept thru #montecitooaks neighborhood. Mud buckling doors trying to get in house. People on roofs. Power out. Power lines down all over #mudslide pic.twitter.com/1SvgOpqBTw
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">https://twitter.com/caffeineben/status/950711044921442304" class="off-screen" tabindex="-1">End of Twitter post by @caffeineben— (@caffeineben) End of Twitter post by @caffeineben"> — (@femaregion9) Skip Twitter post by @femaregion9 ">
Did You Know?
Homes near burned areas can flood, even if they never have before. Regular homeowner's insurance does not protect against flood damage.
There is a 30-day waiting period before most flood insurance policies are effective. pic.twitter.com/YV62ehGpNA— FEMA Region 9 (@femaregion9) January 8, 2018
BBC
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