Authorities in California have vowed to arrest anybody caught looting in burnt-out neighbourhoods, with one official warning: “We are not screwing around with this.”

Five separate wildfires continue to burn across Los Angeles County, including the Pacific Palisades blaze – which has torn through more than 20,000 acres of land and destroyed an estimated 5,000 structures.

Los Angeles sheriff Robert Luna said a curfew enforced overnight on Thursday would start again at 6pm local time on Friday (2am on Saturday, UK time).

LA fires updates:
Wildfires burn for fourth day killing at least 10

The curfew – which forbids anyone from entering mandatory evacuation areas between 6pm and 6am – was brought in after officers arrested several people for looting in the burned areas. It will be “strictly enforced”, Sheriff Luna added.

“We’re not screwing around with this, we don’t want people taking advantage of our residents that have already been victimised,” he said at a press conference.

The punishment for looting is a $1,000 fine and even potential jail time.

The National Guard has been deployed to help secure areas affected by the fires. They are helping to manage restriction zone checkpoints and prevent looting.

Pacific Palisades, which has borne the brunt of the destruction, is an exclusive neighbourhood loved by celebrities – many of whom have seen their homes completely burnt out.

Paris Hilton’s house in the nearby Malibu has also been destroyed, along with a number of other beachfront properties.

Authorities are cracking down on illegal drone usage in fire traffic areas after a fire-fighting ‘super scooper’ plane was grounded due to being damaged by a drone.

They are continuing to investigate what caused the fires. A suspected arsonist was arrested near the Kenneth fire on Thursday afternoon local time.

The officials’ warning to looters came as 153,000 people remain under evacuation orders. While the fires are still burning, some evacuated residents have been able to make brief trips to their neighbourhoods – where many have discovered their homes reduced to ashes.

Authorities have also confirmed at least 10 people have been killed.

Among them was Rodney Nickerson, an 82-year-old who decided to stay in his home in Altadena, a suburb north of Los Angeles.

His daughter Kimiko Nickerson told Sky News: “He just didn’t want to evacuate. He’s been living here since 1968, and he’s been in Altadena my whole life.

“Like all of us on this block, in four blocks, he didn’t think it was going to be this devastating.”

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The Palisades blaze – the biggest of the five – is just 8% contained, while the Kenneth fire, which threatens another celebrity-loved neighbourhood, Calabasas, has burnt through 1,000 acres and is 35% contained.

At least 10,000 structures, including thousands of homes, have been destroyed across the region.

The fires that have been raging in Los Angeles County this week may be the “most destructive” in modern US history.

In just three days, the blazes have covered tens of thousands of acres of land and could potentially have an economic impact of up to about $150bn (£123bn), according to private forecaster Accuweather.

Sky News has used a combination of open-source techniques, data analysis, satellite imagery and social media footage to analyse how and why the fires started, and work out the estimated economic and environmental cost.

More than 1,000 structures have been damaged so far, local officials have estimated. The real figure is likely to be much higher.

“In fact, it’s likely that perhaps 15,000 or even more structures have been destroyed,” said Jonathan Porter, chief meteorologist at Accuweather.

These include some of the country’s most expensive real estate, as well as critical infrastructure.

Accuweather has estimated the fires could have a total damage and economic loss of between $135bn and $150bn.

“It’s clear this is going to be the most destructive wildfire in California history, and likely the most destructive wildfire in modern US history,” said Mr Porter.

“That is our estimate based upon what has occurred thus far, plus some considerations for the near-term impacts of the fires,” he added.

The calculations were made using a wide variety of data inputs, from property damage and evacuation efforts, to the longer-term negative impacts from job and wage losses as well as a decline in tourism to the area.

The Palisades fire, which has burned at least 20,000 acres of land, has been the biggest so far.

Satellite imagery and social media videos indicate the fire was first visible in the area around Skull Rock, part of a 4.5 mile hiking trail, northeast of the upscale Pacific Palisades neighbourhood.

These videos were taken by hikers on the route at around 10.30am on Tuesday 7 January, when the fire began spreading.

At about the same time, this footage of a plane landing at Los Angeles International Airport was captured. A growing cloud of smoke is visible in the hills in the background – the same area where the hikers filmed their videos.

The area’s high winds and dry weather accelerated the speed that the fire has spread. By Tuesday night, Eaton fire sparked in a forested area north of downtown LA, and Hurst fire broke out in Sylmar, a suburban neighbourhood north of San Fernando, after a brush fire.

These images from NASA’s Black Marble tool that detects light sources on the ground show how much the Palisades and Eaton fires grew in less than 24 hours.

On Tuesday, the Palisades fire had covered 772 acres. At the time of publication of Friday, the fire had grown to cover nearly 20,500 acres, some 26.5 times its initial size.

The Palisades fire was the first to spark, but others erupted over the following days.

At around 1pm on Wednesday afternoon, the Lidia fire was first reported in Acton, next to the Angeles National Forest north of LA. Smaller than the others, firefighters managed to contain the blaze by 75% on Friday.

On Thursday, the Kenneth fire was reported at 2.40pm local time, according to Ventura County Fire Department, near a place called Victory Trailhead at the border of Ventura and Los Angeles counties.

This footage from a fire-monitoring camera in Simi Valley shows plumes of smoke billowing from the Kenneth fire.

Sky News analysed infrared satellite imagery to show how these fires grew all across LA.

The largest fires are still far from being contained, and have prompted thousands of residents to flee their homes as officials continued to keep large areas under evacuation orders. It’s unclear when they’ll be able to return.

“This is a tremendous loss that is going to result in many people and businesses needing a lot of help, as they begin the very slow process of putting their lives back together and rebuilding,” said Mr Porter.

“This is going to be an event that is going to likely take some people and businesses, perhaps a decade to recover from this fully.”

The Data and Forensics team is a multi-skilled unit dedicated to providing transparent journalism from Sky News. We gather, analyse and visualise data to tell data-driven stories. We combine traditional reporting skills with advanced analysis of satellite images, social media and other open source information. Through multimedia storytelling we aim to better explain the world while also showing how our journalism is done.

Donald Trump has been handed a no-penalty sentence following his conviction in the Stormy Daniels hush money case.

The incoming US president has received an unconditional discharge – meaning he will not face jail time, probation or a fine.

Manhattan Judge Juan M Merchan could have jailed him for up to four years.

The sentencing in Manhattan comes just 10 days before the 78-year-old is due to be inaugurated as US president for a second time on 20 January.

Trump appeared at the hearing by video link and addressed the court before he was sentenced, telling the judge the case had been a “very terrible experience” for him.

He claimed it was handled inappropriately and by someone connected with his political opponents – referring to Manhattan district attorney Alvin Bragg.

As it happened:
Trump sentenced in Manhattan court

Trump said: “It was done to damage my reputation so I would lose the election.

“This has been a political witch hunt.

“I am totally innocent. I did nothing wrong.”

Concluding his statement, he said: “I was treated very unfairly and I thank you very much.”

The judge then told the court it was up to him to “decide what is a just conclusion with a verdict of guilty”.

He said: “Never before has this court been presented with such a unique and remarkable set of circumstances.

“This has been a truly extraordinary case.”

He added that the “trial was a bit of a paradox” because “once the doors closed it was not unique”.

Prosecutor Joshua Steinglass had earlier argued in court that Trump “engaged in a campaign to undermine the rule of law” during the trial.

“He’s been unrelenting in his attacks against this court, prosecutors and their family,” Mr Steinglass said.

“His dangerous rhetoric and unconstitutional conduct has been a direct attack on the rule of law and he has publicly threatened to retaliate against the prosecutors.”

Mr Steinglass said this behaviour was “designed to have a chilling effect and to intimidate”.

It comes after the US Supreme Court rejected a last-ditch attempt by Trump to delay sentencing in the case on Thursday.

Trump’s lawyers argued that evidence used during the trial violated last summer’s Supreme Court ruling giving Trump broad immunity from prosecution over acts he took as president.

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Trump’s hush money conviction in May 2024 means he will become the first person convicted of a felony to assume the US presidency.

He was found guilty in New York of 34 counts of falsifying business records relating to payments made to Ms Daniels, an adult film actor, before he won the 2016 US election.

Prosecutors claimed he had paid her $130,000 (£105,300) in hush money to not reveal details of what Ms Daniels said was a sexual relationship in 2006.

Trump has denied any liaison with Ms Daniels or any wrongdoing.

The trial made headlines around the world but the details of the case or Trump’s conviction didn’t deter American voters from picking him as president for a second time.

What is an unconditional discharge?

Under New York state law, an unconditional discharge is a sentence imposed “without imprisonment, fine or probation supervision”.

The sentence is handed down when a judge is “of the opinion that no proper purpose would be served by imposing any condition upon the defendant’s release”, according to the law.

It means Trump’s hush money case has been resolved without any punishment that could interfere with his return to the White House.

Unconditional discharges have been handed down in previous cases where, like Trump, people have been convicted of falsifying business records.

They have also been applied in relation to low-level offences such as speeding, trespassing and marijuana-related convictions.