Tens of thousands of people have been killed in the Sudanese city of Al Fashir by the Rapid Support Forces (RSF) in a two-day window after the paramilitary group captured the regional capital, analysts believe.

Sky News is not able to independently verify the claim by Yale Humanitarian Labs, as the city remains under a telecommunications blackout.

Stains and shapes resembling blood and corpses can be seen from space in satellite images analysed by the research lab.

Nathaniel Raymond, executive director of Yale Humanitarian Labs, said: “In the past 48 hours since we’ve had [satellite] imagery over Al Fashir, we see a proliferation of objects that weren’t there before RSF took control of Al Fashir – they are approximately 1.3m to 2m long which is critical because in satellite imagery at very high resolution, that’s the average length of a human body lying vertical.”

Mini Minawi, the governor of North Darfur, said on X that 460 civilians have been killed in the last functioning hospital in the city.

The Sudan Doctors Network has also shared that the RSF “cold-bloodedly killed everyone they found inside Al Saudi Hospital, including patients, their companions, and anyone else present in the wards”.

World Health Organisation (WHO) chief Dr Tedros Adhanom Ghebreyesus said it was “appalled and deeply shocked” by the reports.

Satellite images support the claims of a massacre at Al Saudi Hospital, according to Mr Raymond, who said YHL’s report detailed “a large pile of them [objects believed to be bodies] against a wall at one building at Saudi hospital. And we believe that’s consistent with reports that patients and staff were executed en masse”.

In a video message released on Wednesday, RSF commander Mohamed Hamdan Dagalo acknowledged “violations in Al Fashir” and claimed “an investigation committee should start to hold any soldier or officer accountable”.

The commander is known for committing atrocities in Darfur in the early 2000s as a Janjaweed militia leader, and the RSF has been accused of carrying out genocide in Darfur 20 years on.

Sources have told Sky News the RSF is holding doctors, journalists and politicians captive, demanding ransoms from some families to release their loved ones.

One video shows a man from Al Fashir with an armed man kneeling on the ground, telling his family to pay 15,000. The currency was not made clear.

In some cases, ransoms have been paid, but then more messages come demanding that more money be transferred to secure release.

Muammer Ibrahim, a journalist based in the city, is currently being held by the RSF, who initially shared videos of him crouched on the ground, surrounded by fighters, announcing his hometown had been captured under duress.

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He is being held incommunicado as his family scrambles to negotiate his release. Muammer courageously covered the siege of Al Fashir for months, enduring starvation and shelling.

The Committee to Protect Journalists regional director Sara Qudah said the abduction of Muammar Ibrahim “is a grave and alarming reminder that journalists in Al Fashir are being targeted simply for telling the truth”.

At least 30 people have died after Hurricane Melissa tore through the Caribbean on Wednesday.

The Red Cross said early indications show the storm has been a “disaster of unprecedented catastrophe”.

Storm Melissa has so far ravaged through Jamaica, Haiti, the Dominican Republic and Cuba.

At least 34 are estimated to be dead in the Caribbean, with eight of those in Jamaica, one in the Dominican Republic and 25 in Haiti.

This was down from a previously reported 40.

‘Heartbreaking’ aerial footage reveals scale of destruction

Later on Wednesday, the Jamaican government confirmed four people – three men and one woman – had been killed. This figure later rose to eight.

Local government minister, Desmond McKenzie, said: “They were discovered after being washed up by the flood waters generated by the hurricane.”

Devastating aerial footage shows towns destroyed by the storm.

The Jamaican prime minister, Andrew Holness, travelled to St Elizabeth, where the first deaths were reported, to inspect the storm’s impact.

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Sharing aerial footage of battered homes, he wrote: “The damage is great, but we are going to devote all our energy to mount a strong recovery.”

The storm made landfall in Cuba in the early hours of Wednesday morning before leaving mid-afternoon, heading towards the Bahamas.

‘Whole communities are underwater’

Alexander Pendry, British Red Cross global response manager, said: “News is already coming through that whole communities are underwater and that the damage left by the strong winds has been devastating.

“The Jamaica Red Cross has been proactively supporting communities by preparing essential supplies and managing shelters. Their priority now is to reach people with aid as soon as possible.

“Across the Caribbean, Red Cross teams have been mobilising as Melissa continues its trajectory across Cuba, Dominican Republic and Haiti.”

He added: “Tragically, experience tells us that the impact on communities and individuals will be shattering and long lasting.

“We will be here for as long as people need us.”

The two suspects arrested over the Louvre jewellery heist have “partially” confessed to their involvement in the robbery, according to a prosecutor.

Paris prosecutor Laure Beccuau revealed the development at a news conference on Wednesday.

Four thieves stole nine items – one of which was dropped and recovered at the scene – in a heist pulled off while the world-famous Paris museum was open to visitors on 19 October.

It took the thieves less than eight minutes to steal the jewels. They forced open a window and cut into cases with power tools after gaining access via a vehicle-mounted mechanical lift.

Ms Beccuau also said the jewels had not yet been recovered.

“These jewels are now, of course, unsellable,” said Ms Beccuau. “Anyone who buys them would be guilty of concealment of stolen goods. It’s still time to give them back.”

‘No evidence’

Ms Beccuau also addressed reports that police believe the robbery could have been an inside job.

She said that there was “no evidence the thieves benefited from inside help”.

Under French rules for organised theft, custody can run up to 96 hours. That limit is due to expire late on Wednesday, and prosecutors must charge the suspects, release them or seek a judge’s extension.

One suspect is a 34-year-old Algerian national who has been living in France since 2010, Ms Beccuau said. He was arrested Saturday night at Charles de Gaulle airport as he was about to fly to Algeria with no return ticket.

Ms Beccuau said that he was living in the Paris suburb of Aubervilliers, and was known to police mostly for road traffic offences.

The other suspect, 39, was arrested Saturday night at his home in Aubervilliers.

“There is no evidence to suggest that he was about to leave the country,” said Ms Beccuau.

The man was known to police for several thefts, and his DNA was found on one of the glass cases where the jewels were displayed, and on items the thieves left behind, she added.

Earlier, French police acknowledged major gaps in the Louvre’s defences.

Paris police chief Patrice Faure told politicians that ageing security systems had left weak spots.

“A technological step has not been taken,” he said.

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Mr Faure also revealed that the Louvre’s authorisation to operate its security cameras quietly expired in July and had not been renewed.

He said the first alert to police came not from the Louvre’s alarms, but from a cyclist outside who dialled the emergency line after seeing helmeted men with a basket lift.

Mr Faure also rejected calls for a permanent police post inside the museum, warning it would set an unworkable precedent and do little against fast and mobile thieves.

“I am firmly opposed,” he said. “The issue is not a guard at a door; it is speeding the chain of alert.”