As the Israeli army advances on Gaza City, thousands of families remain in the city’s crowded tent camps.

Sky News analysis of satellite imagery taken on Monday 15 September shows tent camps stretching across the western half of the city.

A close-up view shows one camp spilling out on to the city’s beaches.

The Israel Defence Forces (IDF) launched its ground assault overnight on Tuesday 16 September, in what the military said was a “new phase” in its offensive.

“Gaza is burning,” defence minister Israel Katz posted on X as the operation began. “IDF soldiers are fighting bravely to create the conditions for the release of the hostages and the defeat of Hamas.”

UK Foreign Secretary Yvette Cooper described the offensive as “utterly reckless and appalling”, adding that it “will only bring more bloodshed, kill more innocent civilians & endanger the remaining hostages”.

Footage verified by Sky News shows Israeli tanks entering the Gaza Strip from the north overnight on Tuesday.

Israeli soldiers later filmed themselves in an area just north of Gaza City.

Satellite imagery taken a day earlier shows that while some tent camps in the area have been abandoned in the past few days, many others have not.

The IDF advance comes after an intense week of airstrikes targeting buildings in Gaza City. Sky News has verified dozens of videos showing strikes on buildings across the city.

Several of these strikes destroyed entire tower blocks, such as this strike on Al Ghafari Tower.

At least 50 people were killed across the Gaza Strip on Tuesday, health officials said, most of them in Gaza City.

The IDF said it estimated 40% of people in Gaza City had fled south, while Hamas said that only 190,000 out of 1.3 million residents had left (15%).

An evacuation order for the entire city was first issued on 9 September, with a map on 13 September instructing Palestinians to flee to what Israel has designated a “humanitarian area” along a stretch of sandy coastline known as Al Mawasi.

Satellite imagery from Sunday 14 September shows that the area is already crowded with tents.

Last week, the UN’s Gaza humanitarian country team said that “neither the size nor scale of services provided is fit to support those already there, let alone new arrivals”.

Those fleeing south face a journey of at least 15km (9.3 miles), much of it through Israeli-designated combat zones. Local health officials said at least one vehicle travelling south from Gaza City had been hit by an Israeli strike.

Among those staying put on Tuesday was Um Mohammad, who lives in the Sabra neighbourhood of Gaza City.

“It is like escaping from death towards death, so we are not leaving,” she said.

The IDF says the next stage of the operation will involve both air and ground forces, and that the number of soldiers involved will increase over the coming days.

Additional reporting by Sam Doak, OSINT producer.

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.

Israel is committing genocide in Gaza, according to a commission established by the United Nations.

The report claims “it is clear that there is an intent to destroy the Palestinians in Gaza” and says Israel’s actions meet the criteria set down for defining a genocide.

It is the first time that such an explosive allegation has been made publicly by a UN body, and is likely to be greeted with fury by the Israeli government.

Follow live updates: ‘Gaza is burning’ after overnight strikes

Israel‘s Foreign Ministry said it “categorically rejects this distorted and false report” and called for the commission to be abolished.

“Three individuals serving as Hamas proxies, notorious for their openly antisemitic positions – and whose horrific statements about Jews have been condemned worldwide – released today another fake ‘report’ about Gaza,” it said in a statement.

“The report relies entirely on Hamas falsehoods, laundered and repeated by others. These fabrications have already been thoroughly debunked.”

The accusation of genocide is made by the UN Independent International Commission of Inquiry on the Occupied Palestinian Territory.

The commission, which has been studying the conduct of Israel since the Hamas attacks of 7 October 2023, has concluded that Israel has committed four of the five acts laid out in the Genocide Convention.

It alleges Israel has been killing Palestinians or forcing them to live in inhumane conditions that led to death; causing serious bodily or mental harm, including through torture, displacement and sexual crime; deliberately imposing inhumane conditions, and fourthly, imposing measures intending to prevent births.

This final claim is linked to an attack on the Al-Basma IVF clinic, which the commission claims destroyed around 4,000 embryos and a further 1,000 sperm samples.

The report claims Israel has “flagrantly” ignored “numerous warnings” over the humanitarian crisis in Gaza and has set out to “destroy the healthcare system in Gaza”.

It also alleges that Israeli military personnel have carried out sexual and gender-based violence, including “rape and sexualised torture”, as part of “a pattern of collective punishment”, and accuses Israeli forces of deliberately targeting some children “with the intention to kill them”.

Although other UN bodies and personnel have previously linked Israel’s actions with allegations of genocide, this is the first time that any UN body has claimed to have made a definitive judgment.

“The responsibility for these atrocity crimes lies with the Israeli authorities at the highest echelons,” said Navi Pillay, the chair of the commission.

Within the report, it concludes that “Israeli President Isaac Herzog, Prime Minister Benjamin Netanyahu and then Defence Minister Yoav Gallant, have incited the commission of genocide”.

Nearly 65,000 people are now believed to have died, according to figures collated by Gaza’s health ministry. It does not distinguish between civilians and combatants in its count.

The commission claims that a majority of these are women, children and elderly people.

The commission says it is now looking at further evidence against other individuals accused of inciting genocide.

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Last year, the International Criminal Court (ICC) issued arrest warrants against both Mr Netanyahu and Mr Gallant for allegedly committing the war crime of using starvation as a method of warfare and also for war crimes during the Gaza conflict.

Mr Netanyahu described the warrants as “antisemitic”, while a sense of outrage echoed across much of the political spectrum in Israel.

Then US President Joe Biden called the warrants “outrageous”; his successor, Donald Trump, issued an executive order to introduce sanctions against personnel from the ICC, while inviting Netanyahu to the White House.

It is hard to believe that either Israel or the US will be any more accepting of this report. Israel has long claimed that the UN is biased against it and is more liable to criticise Israel than any other nation.

The US, which offered a rare, if mild, rebuke to Mr Netanyahu after he launched an attack on Hamas officials in Qatar last week, has since sent Secretary of State Marco Rubio to Jerusalem as a sign of solidarity.

The commission has asked for nations to stop supplying Israel with weapons and says states have a “legal obligation” to do everything within their power “to stop the genocide in Gaza”.

It also calls on Israel to immediately allow “unhindered” access for internationally recognised aid agencies, including the UN.

It wants the Gaza Humanitarian Foundation (GHF), set up earlier this year by Israel with American help, in order to distribute aid, to be shut down.

Hundreds of people have been killed around GHF sites, while a separate UN-backed body has said that parts of Gaza have been designated as suffering from famine.

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Israel denies this – a senior military leader told me that “it is a pure, total lie – there is enough food for everyone”. It claims that the UN relied on faulty data and Hamas propaganda.

This latest UN report is likely to be met with similar claims.

Earlier this month, the International Association of Genocide Scholars passed a resolution stating that Israel’s conduct passed the threshold of committing genocide.

However, a report from the British government said it had “not concluded” that Israel intended to “destroy in whole or in part a national, ethnic, racial or religious group”.

Volodymyr Zelenskyy has called for a “clear position” from Donald Trump to stop Vladimir Putin and end the war in Ukraine.

In an exclusive interview with Sky News’ lead world presenter Yalda Hakim, the Ukrainian president said the only way for the fighting to stop was for defined security guarantees to first be put in place.

And that, he said, could only come if Mr Trump was bold.

He told Sky News he hopes UK Prime Minister Sir Keir Starmer would drill into the detail of securing Ukraine’s future with the president during his state visit to Britain this week.

He said: “I very much hope he (Starmer) will be able to have a very specific discussion on the security guarantees of the US for Ukraine.

“Before we end the war, I really want to have all the agreements in place. I want to… have a document that is supported by the US and all European partners. This is very important.

“To make this happen, we need a clear position of President Trump.”

‘Make Putin afraid’

Mr Zelenskyy also urged the US leader to take “strong personal steps” to “stop Putin”, after Mr Trump urged NATO allies to stop buying Russian oil and put tariffs on China to pressure Moscow.

“I believe that the US is strong enough to take decisions of their own,” he said. “I believe Donald Trump can give us air defence systems in quantity and US has enough.

“I’m sure the US can apply enough sanctions in order to hurt the Russian economy, plus Donald Trump has enough force to make Putin afraid of him.

“Europe has already introduced 18 sanctions packages against Russia. And all that’s lacking now is a strong sanctions package from the US.”

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His comments came following criticism in his interview with Sky News – at the Presidential Palace in Kyiv – of the recent Trump-Putin summit in Alaska.

He said Mr Trump “gave a lot to Putin” and that “he should have paid more” for it.

“I believe, if it was a trilateral meeting [with Ukraine included], we would have some result,” he added.

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Putin ‘testing NATO’, warns Zelenskyy

As news broke that British fighter jets were flying air defence missions over Poland after a Russian drone incursion, Hakim asked the Ukrainian leader what message he thought Putin was sending to Europeans.

“He’s testing NATO,” he said. “He wants to see what NATO is ready for, what they’re capable of, both diplomatically and politically, and how the local population will respond to this.”

“Also, in my opinion, the other message they are sending is, ‘don’t you dare to give Ukraine additional air defence systems, because you might need them yourself.'”

Bristling with frustration – Zelenskyy’s message is clear

Yalda Hakim

Lead world news presenter

@SkyYaldaHakim

Ukraine’s president has a very clear message for Trump – you alone have the power to stop Putin, and the time to act is now.

Meeting with me in Kyiv on the eve of the US president’s state visit to Britain, Zelenskyy bristled with frustration at the failure of the Western powers to ramp up pressure on the Kremlin, even as the Russians escalated their attacks on Ukraine.

Asked if the summit between Trump and Putin in Alaska has proven a mistake, he responded without hesitation that Putin is clearly not paying a price for his actions.

Zelenskyy believes Trump is reluctant to put pressure on Putin because it might jeopardise attempts to end the war.

But the Ukrainian leader argues this isn’t the way to handle the Russian president.

Zelenskyy also argued Trump’s emphasis on getting the Europeans to ratchet up economic pressure – foremost by stopping their purchases of Russian energy and tariffing other buyers like China and India – was understandable, but that the world’s sole superpower shouldn’t wait for others to act.

Trump has called on EU countries to end all Russian oil and gas purchases – and only then will he consider imposing sanctions on Russia.

Mr Trump arrives in the UK today for an unprecedented second state visit, following an invitation from King Charles.

He and First Lady Melania will stay at Windsor Castle and be treated to a flypast by the Red Arrows as well as UK and US F-35 military jets on the east lawn, and a special Beating Retreat military ceremony.

They will also visit Chequers, the prime minister’s official country residence in Buckinghamshire, though details of what they will discuss – and whether it will include the situation in Ukraine – have not been revealed.