For three weeks, Israel has been bombing the Gaza Strip as part of its war with Hamas.
The two sides have published conflicting accounts of the toll taken by the airstrikes. Satellite data gives us an independent view.
Every 12 days, NASA’s Sentinel-1 satellite passes three times over the Gaza Strip, firing out radar waves and listening for their echo. Buildings typically bounce the signals right back, but rubble scatters them in all directions.
By comparing signals before the war with those taken more recently, we can estimate the scope and scale of the destruction.
This map shows what Gaza looked like before the war, its population densely clustered in Gaza City, in the far north, and the southern cities of Rafah and Khan Younis.
Image: Map of buildings in the Gaza Strip, with major cities highlighted. SOURCE: Open Street Map
By 13 October, six days after Hamas launched its attacks in southern Israel, much of Gaza City had been hit by airstrikes.
The satellite data suggests 15% of buildings in northern Gaza were damaged or destroyed in less than a week, along with 2% in southern Gaza.
That same day, Israel ordered all 1.1 million residents of northern Gaza to flee southwards to relative safety.
Since then, however, Israel has stepped up its bombing of the south.
The map below shows the estimated damage to buildings across Gaza on 13 and 25 October, with the most damaged areas highlighted in yellow.
Almost half of all new damage detected between 14 and 25 October was in southern Gaza (47%), up from 14% before the evacuation order.
While there was a decrease in new damage across the Gaza Strip during those two weeks, the level of destruction in southern Gaza increased by 85%.
A spokesperson for the Israeli Defence Forces declined to comment.
Many of those who fled the north after 13 October have ended up in the Gaza Strip’s second most populous city, Khan Younis.
Since then, satellite data shows neighbourhoods across the city have sustained damage.
The video below, uploaded to Snapchat on 24 October, shows smoke rising from behind a school in Khan Younis.
Sky News has verified the location of the footage, and satellite analysis shows that a row of buildings immediately behind the school sustained damage between 14 and 25 October.
The Gaza Strip has been under aerial bombardment since Hamas’s 7 October attack, in which the Israeli government says more than 1,400 were killed.
Israel says that Hamas is still holding more than 200 people hostage inside the enclave. Five British citizens remain missing.
The airstrikes come as Israel prepares to launch an anticipated ground invasion of the Gaza Strip.
According to Gaza’s health ministry, which is controlled by Hamas, more than 6,500 people have been killed in the airstrikes – two-thirds of them women and children.
Sky’s satellite data suggests that one in four buildings in northern Gaza (25%) have been damaged or destroyed in the past three weeks, along with 8% of those in the south.
The Rimal neighbourhood of Gaza City has been hit particularly hard.
This video below, uploaded to Snapchat on 20 October and verified by Sky News, shows the local high street in ruins.
From the satellite analysis, we can see that the video shows just a small part of the destruction in Rimal.
Image: Map of estimated damage to buildings in Rimal, Gaza Strip, 25 October. SOURCE: NASA/Open Street Maps
Sky’s analysis of satellite data followed a method developed by academics and promoted by NASA.
This is a conservative estimate – Sky News has only classified an area as damaged if the satellite records at least a 30% decrease in surface smoothness over a 1,600 square metre area.
Damage to a single building, or even its total destruction, is unlikely to reach that threshold. Damage to the side of buildings may not be detected at all.
The Gaza Ministry of Public Works says that 27,781 housing units, or around 7% of the total, have been destroyed or rendered uninhabitable since 7 October.
Additional reporting by Sanya Burgess
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.
Vladimir Putin has played down the possibility of a meeting with Volodymyr Zelenskyy, saying that while it is possible, certain conditions must be met.
The Russian president was responding to an American proposal of a trilateral meeting between him, the Ukrainian president and Donald Trump.
The idea was floated by Steve Witkoff, the US president’s envoy during talks with Mr Putin on Wednesday, Kremlin aide Yuri Ushakov said.
Mr Ushakov said the three-way option was “simply mentioned by the American representative during the meeting in the Kremlin”.
He added, however: “This option was not specifically discussed.”
On the prospect of meeting Mr Zelenskyy, Vladimir Putin said: “I have already said many times that I have nothing against it in general – it is possible.”
However, he distanced himself from any such meeting happening soon, adding: “But certain conditions must be created for this. Unfortunately, we are still far from creating such conditions.”
Image: Pic: AP
Mr Zelenskyy offered to speak to Vladimir Putin in May, challenging him to meet in Istanbul for talks on ending the war in Ukraine – an invitation the Russian leader declined.
While a trilateral meeting appears to be off the agenda, Mr Ushakov said an agreement had been reached for Donald Trump and Vladimir Putin to meet “in the coming days”.
After the US president touted a “very good prospect” of the leaders meeting for Ukraine ceasefire talks, Mr Ushakov said on Thursday that Russian and American officials had started working on the details.
“At the suggestion of the American side, an agreement was essentially reached to hold a bilateral meeting at the highest level in the coming days,” he said.
“We are now beginning concrete preparations together with our American colleagues.”
Regarding a trilateral meeting, Mr Ushakov said: “We propose, first of all, to focus on preparing a bilateral meeting with Trump, and we consider it most important that this meeting be successful and productive.”
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Will Putin agree to Trump’s condition to meet Zelenskyy?
It would be the first time the two leaders have met since Mr Trump returned to office, and follows a three-hour meeting between Mr Putin and Steve Witkoff in Moscow on Wednesday.
Following the meeting, Volodymyr Zelenskyy said it appeared that Russia was “more inclined to a ceasefire”.
The Ukrainian president said he planned to speak on Thursday to German Chancellor Friedrich Merz, as well as contacts from France and Italy.
He said he planned to discuss a ceasefire, a leaders’ summit and long-term security, adding: “Ukraine has never wanted war and will work toward peace as productively as possible.”
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A poll from Gallup suggests 69% of Ukrainians support a negotiated end to the war with Russia – an almost complete reversal from 2022, when 73% favoured fighting until victory.
Most said they were sceptical the war would end soon, with 68% saying they believed it was unlikely that active fighting would stop within the next 12 months.
Staff at a zoo in Germany which culled 12 baboons and fed some of their carcasses to the lions say they have received death threats.
Tiergarten Nuremberg euthanised the healthy Guinea baboons at the end of July due to overcrowding in their enclosure.
Some remains were used for research while the rest were fed to the zoo’s carnivores.
Plans to kill the baboons were first announced last year after the population exceeded 40, and protestors gathered outside the zoo to show their outrage.
When the site closed last Tuesday to carry out the cull, several activists were arrested after climbing the fence.
The director of the zoo defended the decision, saying efforts to sterilise and rehome some baboons had failed.
“We love these animals. We want to save a species. But for the sake of the species, we have to kill individuals otherwise we are not able to keep up a population in a restricted area,” Dr Dag Encke told Sky News.
Image: These are not the specific animals involved. File pics: Reuters
‘The staff are suffering’
He said police are investigating after he and the staff were sent death threats.
“The staff are really suffering, sorting out all these bad words, insults and threats,” Dr Encke said.
“The normal threat is ‘we will kill you, and we’ll feed you to the lions’.
“But what is really disgusting is when they say that’s worse than Dr Mengele from the National Socialists, who was one of the most cruel people in human history.
“That is really insulting all the victims of the Second World War and the Nazi regime.”
Josef Mengele was a Nazi officer who performed deadly experiments on prisoners at the Auschwitz concentration camp during the Second World War.
Image: Dr Dag Encke
Zoo animals ‘treated as commodities’
Culling animals and feeding them to predators isn’t unheard of in zoos.
At the time, the zoo said it was due to a duty to avoid inbreeding.
Dr Mark Jones, a vet and head of policy at Born Free Foundation, a charity which campaigns for animals to be kept in the wild, denounced the practice and said thousands of healthy animals are being destroyed by zoos each year.
“It reflects the fact animals in zoos are often treated as commodities that are disposable or replaceable,” he said.
Image: Marius the giraffe was put down and publicly fed to lions at at Copenhagen Zoo in Denmark. Pic: Keld Navntoft/AFP/Getty
Zoo asks for unwanted pets
Earlier this week, a zoo in Denmark faced a backlash for asking for unwanted pets to be donated to be used as food for its predators.
In a Facebook post, Aalborg Zoo said it could take smaller live animals such as chickens, rabbits and guinea pigs, as well as horses under 147cm. It said the animals would be euthanised by specially trained staff before being fed to carnivores like the European lynx.
While some people supported the scheme, saying they had donated animals in the past, others are outraged.
“The very idea of a zoo offering to take unwanted pets in order to kill them and feed them to their predators will, I think, horrify most right-minded people,” said Dr Jones.
Aalborg Zoo has now closed the post to comments and said in a statement: “For many years at Aalborg Zoo, we have fed our carnivores with smaller livestock.
“When keeping carnivores, it is necessary to provide them with meat, preferably with fur, bones, etc., to give them as natural a diet as possible.
“Therefore, it makes sense to allow animals that need to be euthanised for various reasons to be of use in this way.
“In Denmark, this practice is common, and many of our guests and partners appreciate the opportunity to contribute.”