In the week since, Israel has retaliated by bombing Gaza, from where the militants launched the attack.
Civilians have been caught up in the reprisals, as they try to flee south and thousands have died on both sides of the conflict.
Israel’s prime minister, Benjamin Netanyahu, has said the “next stage” of the country’s response is coming – with a ground offensive, supported by air and sea attacks, expected on Gaza.
Speaking on Saturday evening, Mr Sunak defended Israel’s right to defend itself, saying: “We stand with Israel, not just today, not just tomorrow, but always.”
“And I stand with you, the British Jewish community, not just today, not just tomorrow, but always.
“Am Yisrael Chai,” he added.
Am Yisrael Chai translates as ‘the people of Israel live’.
Mr Sunak said that he knew the coming days and weeks would be “very difficult”.
“No words can begin to describe the horror and barbarism unleashed in Israel a week ago,” he said. “Daughters, sons, mothers, fathers, husbands, wives, grandparents taken from people in the cruellest and most horrific way possible.
“Hundreds of people have been killed, many wounded or missing and others living through the unimaginable agony of having a loved one kidnapped and held hostage.
“British citizens were among the victims. And as we continue to learn more, I know there are families here and in Israel in deep pain and torment.
“My thoughts and my heart go out to everyone suffering in the wake of these attacks.”
‘We will do everything to protect Jewish people’
Mr Sunak also offered a message to the people of Israel.
“Britain is with you,” he said.
“What took place was an act of pure evil and Israel has every right to defend itself. We will do everything we can to support Israel in restoring the security it deserves.”
He told the British Jewish community: “I know you are hurting and reeling from these vile terrorist acts.
“At moments like this, when Jewish people are under attack in their homeland, Jewish people everywhere can feel less safe.
“We’ve seen intimidating behaviour and shameful antisemitism online and on our streets with attempts to stir up tensions.
“I say, not here.
“Not in Britain. Not in our country. Not in this century.
“We will do everything we possibly can to protect Jewish people in our country.
“And if anything is standing in the way of keeping the Jewish community safe, we will fix it.”
Labour leader Sir Keir Starmer also marked a week since the Hamas attack, while calling for safe humanitarian corridors for Palestinians in Gaza fleeing violence.
He said: “A week ago we awoke to the unimaginable and heartbreaking news of terrorist attacks on Israel from Gaza by Hamas.
“In the days that have followed, we have heard horrific stories of the murder and mutilation of men, women and children, along with the horror of hostage-taking.
“Israel has the right, indeed the duty, to defend herself and rescue these hostages. Responsibility for what has happened sits with the terrorists of Hamas; and we repeat our call for Hamas to release all hostages.
“I’ve met with members of the British Jewish community this week and told them that we stand with Israel and with them at this time.”
Sir Keir added: “I know this is a distressing and worrying time and welcome the extra funding for the CST (Community Security Trust).
“There must be zero tolerance of any increase in antisemitism or Islamophobia.
“Hamas has no interest in peace. No interest in protecting Palestinians.
“We call on all parties to act in line with international law, including allowing humanitarian access of food, water, electricity and medicines to Gaza and ensuring safe humanitarian corridors in Gaza for those fleeing violence.
“Seven days on from the darkest day in Israel’s recent history, our resolve in the face of terrorism will not falter.”
Fresh appeals have been made for information on what would have been the 20th birthday of Ellis Cox, who was shot dead in Liverpool last June.
A number of people have been arrested in connection with the murder at Liver Industrial Estate, but no one has been charged yet.
The 19-year-old’s family and police have paid tribute to him and called for those with information to come forward.
He was shot in the back after a confrontation between his friends and another group of up to three males on Sunday 23 June.
His mother Carolyn paid tribute in an appeal to coincide with what would have been his 20th birthday.
“He was so kind… so laid back, so calm, so mature for his age. And he was just funny. Very funny.
“He was my baby… no mum should have to bury a child. He was my life. And I don’t know what to do without him.”
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Meanwhile, his aunt Julie O’Toole said he was “the sort of person I think you’d be hard pressed to find anyone to say anything negative about. He was loyal, fiercely loyal… everything was about his family”.
To pay tribute to Ellis, Liverpool City Council will be lighting up the Cunard Building and Liverpool Town Hall in orange on Saturday.
Detective Chief Inspector Steve McGrath, the senior investigating officer, spoke about the information gathered so far, six months on from Mr Cox’s murder.
“I’m satisfied that the group that he was with was probably the target… and I would say that’s got something in relation to do with localised drug dealing in that area. But Ellis had no involvement in that whatsoever,” he said.
He added that police are looking for “really significant pieces of evidence now”, including “trying to recover the firearm that was used in relation to this, looking to recover the bikes that were used by the offenders”.
A £20,000 reward is being offered for information that leads to the identification of the parents of three siblings found abandoned in London over eight years.
The Metropolitan Police said that despite more than 450 hours of CCTV being reviewed, the parents of the three children, known as Elsa, Roman and Harry, remain unidentified.
However, it is believed their mother has lived in an area of east London “over the past six years”.
Elsa was believed to be less than an hour old when she was found by a dog walker on 18 January last year, in East Ham, east London.
In the months that followed it was found that she had two siblings who were also abandoned in similar circumstances, in the same area of London, in 2017 and 2019.
On Saturday, police said the independent group Crimestoppers had offered a £20,000 reward for information passed to the charity, which will expire on 18 April.
Detective Inspector Jamie Humm, of the Met’s child abuse investigation team, said: “We have carried out extensive inquiries over the past year to try and locate Elsa’s parents.
“This has involved reviewing over 450 hours of CCTV and completing a full DNA structure of the mother.
“We have serious concerns for the wellbeing of the parents, especially the mother, and are continuing to work closely with Newham Council and appeal for the public’s help for information.
“I believe that someone in the area will have been aware of the mother’s pregnancies and that within the community there may be (or) have been concerns for this mother’s welfare.
“Thanks to the DNA work of forensic colleagues, police will be able to eliminate any unconnected person quickly and easily, as such I would ask you to contact police with confidence.”
Elsa was found wrapped in a towel in a reusable shopping bag, of which police have also released a new image, and was kept warm by the dog walker. She was uninjured.
Police said at the time that it was “highly likely” that she was born after a “concealed pregnancy”.
The BBC reported that at an initial court hearing, East London Family Court was told it took doctors three hours to record Elsa’s temperature because of the cold, and the Met Office said that temperatures dropped to as low as -4C on the night she was found.
Hospital staff named her Elsa in a reference to the character from the film Frozen.
The police investigation into the identity of the children’s parents continues, and anyone with information is asked to call police on 101 or post @MetCC ref Operation Wolcott.
People can also contact Crimestoppers anonymously at any time on 0800 555 111 or via Crimestoppers-uk.org.
Fresh appeals have been made for information on what would have been the 20th birthday of Ellis Cox, who was shot dead in Liverpool last June.
A number of people have been arrested in connection with the murder at Liver Industrial Estate, but no one has been charged yet.
The 19-year-old’s family and police have paid tribute to him and called for those with information to come forward.
He was shot in the back after a confrontation between his friends and another group of up to three males on Sunday 23 June.
His mother Carolyn paid tribute in an appeal to coincide with what would have been his 20th birthday.
“He was so kind… so laid back, so calm, so mature for his age. And he was just funny. Very funny.
“He was my baby… no mum should have to bury a child. He was my life. And I don’t know what to do without him.”
More on Liverpool
Related Topics:
Meanwhile, his aunt Julie O’Toole said he was “the sort of person I think you’d be hard pressed to find anyone to say anything negative about. He was loyal, fiercely loyal… everything was about his family”.
To pay tribute to Ellis, Liverpool City Council will be lighting up the Cunard Building and Liverpool Town Hall in orange on Saturday.
Detective Chief Inspector Steve McGrath, the senior investigating officer, spoke about the information gathered so far, six months on from Mr Cox’s murder.
“I’m satisfied that the group that he was with was probably the target… and I would say that’s got something in relation to do with localised drug dealing in that area. But Ellis had no involvement in that whatsoever,” he said.
He added that police are looking for “really significant pieces of evidence now”, including “trying to recover the firearm that was used in relation to this, looking to recover the bikes that were used by the offenders”.