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Cutting greenhouse gas emissions with carbon offsets

Cutting greenhouse gas emissions with carbon offsets

Cutting greenhouse gas emissions with carbon offsets
Climate change activists protest in London with a call on governments to act now to reduce greenhouse gas emissions. (AFP)
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Amid the worsening climate crisis, carbon trading markets have emerged as a cutting-edge tool for controlling greenhouse gas emissions.

These include cap-and-trade systems, which allocate companies a limited number of emission allowances under a set maximum, and carbon offset programs, which let industries earn credits by financing environmentally sound projects to offset their emissions.

The goal is straightforward — reduce emissions by putting a price on carbon pollution.

The carbon market has grown substantially in recent years, reaching an estimated $950 billion in 2023 — a 14 percent increase from its valuation in 2022. This steady growth highlights its rising importance.

However, a key question remains: Are these measures enough to support global efforts to combat climate change?

While the potential of carbon markets is promising, their effectiveness depends on sufficient transparency, a robust legal framework and international collaboration.

Carbon markets play a crucial role in advancing climate action by encouraging businesses to reduce emissions while financing cleaner technologies.

For example, cap-and-trade models incentivize industries to develop low-emission alternatives to meet regulatory standards.

The EU’s Emissions Trading System has successfully implemented this approach, cutting emissions in the EU’s power and industrial sectors by 43 percent since 2005.

Carbon offsets take sustainability to a new level by funding projects such as tree planting and clean energy initiatives. In 2022, voluntary carbon markets directed more than $2 billion into global projects that reduced CO2 emissions.

However, criticisms remain. A lack of standardization can result in “greenwashing,” where low-quality offsets enable companies to maintain high emission levels. A robust legal framework and systematic oversight are essential to prevent malpractice and ensure carbon markets deliver measurable, meaningful climate impacts.

Globally, carbon markets are gaining momentum. In the US, California’s cap-and-trade program has reduced emissions while generating $19 billion to fund clean energy projects.

In Asia, China launched the world’s largest national carbon market in 2021, covering more than 2,200 power plants and representing 4.5 billion tons of CO2 annually.

Yet challenges persist. Price volatility creates uncertainty, as seen in the EU ETS, where carbon prices dropped sharply from around €84 per ton in January 2024 to as low as €52 within about two months, according to the Carbon Market Watch.

Carbon offsets take sustainability to a new level by funding projects such as tree planting and clean energy initiatives.

Majed Al-Qatari

Moreover, fragmented standards in voluntary markets hinder global cohesion, underscoring the need for international frameworks to align efforts, as emphasized during the UN Climate Change Conference, COP29, in Azerbaijan last year.

Carbon markets were a central focus at COP29, with new commitments to expand both voluntary and compliance markets. Officials highlighted Article 6 of the Paris Agreement, which seeks to align carbon market rules across nations and promote international climate action.

The focus also shifted to the credibility of carbon credits. For instance, the Integrity Council for the Voluntary Carbon Markets introduced new standards to ensure that carbon credits deliver real climate impacts.

These developments signal a growing global consensus. As a result, it is crucial that carbon markets uphold the highest levels of transparency, accountability, and credibility.

ֱ has emerged as a leader in advocating for the development of carbon markets through the Saudi Green Initiative. The Kingdom has led efforts focusing on carbon trading, as well as Public Investment Fund mechanisms, to build a regional voluntary carbon market and a dedicated platform for trading carbon credits.

Moreover, the Kingdom plans to invest in carbon credit trading to help reduce emissions in hard-to-abate sectors, including oil and gas.

As such, the Gulf country aims to achieve a carbon sequestration and storage target of 44 million tonnes annually by 2030 as part of its net-zero emissions goal for 2060.

This vision supports ֱ’s broader goal of balancing economic growth with environmental protection.

Looking ahead, the question remains: Can carbon markets achieve the goal of combating climate change?

The International Monetary Fund argues that carbon pricing policies must accurately reflect the cost of carbon emissions. It recommends setting a basic carbon price of $75 per ton by 2030 to help ensure global warming does not exceed 1.5 C above pre-industrial levels.

Innovations like blockchain-based carbon credit systems also offer solutions, addressing transparency and fraud issues while improving market efficiency.

Enhanced international cooperation is crucial as well. Bold agreements, such as those proposed at COP29, can help standardize practices and make fair emissions reductions achievable worldwide.

Carbon markets have significant potential to reduce emissions by encouraging the adoption of cleaner technologies and funding sustainable initiatives. However, their success depends on increased transparency, strict regulations, and global coordination.

When carbon markets are aligned with the goals of international climate policies, they can play a crucial role in driving the world toward a sustainable, low-carbon future.

Majed Al-Qatari is a sustainability leader, ecological engineer and UN Youth Ambassador.

 

Disclaimer: Views expressed by writers in this section are their own and do not necessarily reflect Arab News' point of view

How Israel’s E1 settlement threatens to uproot the West Bank’s Bedouins

How Israel’s E1 settlement threatens to uproot the West Bank’s Bedouins
Updated 10 min 1 sec ago

How Israel’s E1 settlement threatens to uproot the West Bank’s Bedouins

How Israel’s E1 settlement threatens to uproot the West Bank’s Bedouins
  • Bedouins in Jabal Al-Baba face demolition orders, reflecting wider displacement pressures confronting Palestinians
  • Israel’s E1 settlement plan threatens to bisect the West Bank, fragmenting any future Palestinian state

DUBAI: On a cold January morning in 2017, Salem and his wife, Umm Mohammed, watched as bulldozers flattened the modest shelters they had built for their four children. It was the second time in three years their home had been demolished.

“To demolish someone’s house is to wreck their life,” Umm Mohammed told the UN Office for the Coordination of Humanitarian Affairs at the time.

Salem’s family was one of two displaced that winter, when the Israeli Civil Administration, accompanied by soldiers, demolished six structures in Jabal Al-Baba, a small Palestinian Bedouin hamlet perched on a hillside near the sprawling settlement of Ma’ale Adumim.

More than eight years later, the threat of forced displacement looms larger than ever. Some 22 families in Jabal Al-Baba have received demolition orders, giving them 60 days to destroy their own homes.

Israeli security forces, often accompanied by dogs, have repeatedly raided their dwellings at night.

This picture taken on June 30, 2020 shows a view of the Bedouin encampment of Jabal al-Baba, near the Israeli settlement of Maale Adumim in the occupied West Bank on the outskirts of Jerusalem, with the settlement appearing in the background. (AFP/File)

“Where else could I go? There is nothing,” said Atallah Al-Jahalin, leader of the Bedouin community, in a recent interview with Reuters.

The families of Jabal Al-Baba are part of the Jahalin tribe, descendants of Bedouins driven from the Negev Desert during the 1948 Nakba.

They settled on privately owned Palestinian land under lease agreements and sustained a pastoral way of life centered on livestock and seasonal grazing.

Today, around 80 families — about 450 people — call the hamlet home, raising roughly 3,000 sheep and goats that remain their lifeline.

But this way of life is being steadily squeezed by Israel’s E1 settlement plan. The project aims to expand Ma’ale Adumim eastward toward Jerusalem, creating a contiguous bloc of Israeli settlements that would bisect the occupied West Bank and sever East Jerusalem from its Palestinian hinterland.

“You cannot have a Palestinian state with Israeli presence in E1,” Hagit Ofran, an Israeli peace activist and co-director of Settlement Watch at the nongovernmental organization Peace Now, told Arab News.

In August, Israel’s far-right Finance Minister Bezalel Smotrich announced the final approval of some 3,400 housing units in E1. Prime Minister Benjamin Netanyahu signed off on the move weeks later, cementing plans that critics say would make a viable Palestinian state impossible.

OCHA, the UN’s humanitarian office, is “particularly worried” about “the devastating humanitarian impact this plan could have, first and foremost on Palestinians in that area, alongside implications for the wider occupied Palestinian territory,” a spokesperson told Arab News.

IN NUMBERS

3K Bedouins forcibly displaced in the West Bank since Oct. 2023

50 Settler attacks on Bedouins living in Ras Ein Al-Auja in 2025 alone

(Source: NRC)

The blueprint includes construction of a bypass road — dubbed the “Fabric of Life Road” or “Sovereignty Road” — to divert Palestinian traffic away from the Jerusalem-Jericho corridor. The road would cut off Jabal Al-Baba from the nearby town of Al-Eizariya, the hub for education, healthcare, and commerce.

“We are dependent on Al-Eizariya for education as the children go to school there, for health, for everything; our economic situation is also tied to Al-Eizariya,” said Al-Jahalin.

OCHA warns the road scheme would “undermine territorial contiguity, increase travel times, and negatively affect people’s livelihoods and access to services.”

A drone view taken on September 29, 2025, shows a new road, part of the expansion of Israeli bypass roads connecting Israeli setters in the West Bank with Jerusalem, near Hebron in the Israeli-occupied West Bank. (REUTERS/Ammar Awad)

Israeli officials justify the evictions by citing “illegal structures” and security concerns. They have promoted relocation offers in Al-Eizariya or Jericho, presenting them as opportunities to improve infrastructure, education, and healthcare.

However, Bedouins view the proposals as thinly veiled attempts at dispossession.

The community recalls earlier relocations that tore apart their social fabric. A 2013 joint report by the UN agency for Palestinian refugees UNRWA and Israeli NGO Bimkom described how families transferred to Al-Jabal village in the late 1990s endured worsening poverty, overcrowding, and restrictions on women’s movement.

“The allocation of a small parcel for each family and the connection to minimal infrastructure can lead to significant harm to human rights,” Bimkom warned.

For Bedouin families, resisting relocation is as much about identity as survival.

This picture taken on November 23, 2017, Palestinian political leaders with the Greek Orthodox Archbishop Theodosius of Sebastia and spokesperson for the Greek Orthodox Patriarchate in Jerusalem participating in a demonstration against the potential demolition of the Jabal al-Baba Bedouin encampment. Eight years later, the threat of forced displacement looms larger than ever. (AFP)

Since October 2023, more than 3,000 Bedouins — mostly women and children — have been displaced from at least 46 West Bank communities due to settler violence and military-backed demolitions, according to UN figures.

Settler attacks are now a daily occurrence. In Ras Ein Al-Auja alone, more than 50 incidents were recorded in 2025, including the establishment of an illegal outpost that blocked access to grazing land and water.

The UN counts an average of four settler assaults each day. Nearly 2,900 Palestinians have been uprooted since early 2023, most linked to outpost expansion.

Meanwhile, some 700,000 Jewish settlers now live among 3 million Palestinians in the West Bank and East Jerusalem. International law deems the settlements illegal, but Israel asserts historical and religious claims to what it calls Judea and Samaria.

The International Court of Justice ruled in 2004 that Israel’s separation wall inside occupied territory was unlawful and must be dismantled.

This picture shows the Israeli settlement of Pisgat Zeev (L), built in a suburb of the mostly Arab east Jerusalem behind Israel's controversial separation wall on February 7, 2025. (AFP)

OCHA says Israeli plans to extend the barrier around E1 would only deepen movement restrictions and entrench fragmentation.

“There is also a longstanding Israeli plan to encircle the E1 area with additional sections of the 712-km-long barrier,” the UN spokesperson said.

Ofran of Peace Now urged the US to intervene. “The simplest solution is if the Americans would want it to stop. The problem is that they don’t.”

She also called on governments to send symbolic but powerful messages by excluding Israel from international events such as sports tournaments. It would send a “clear message,” without hurting Israel’s economy or security, she said.

Palestinian Bedouin men of Jabal Al-Baba make coffee amid threats of displacement in favor of a new Israeli settlement near the E1 road, in Jabal Al-Baba, Israeli-occupied West Bank, on September 17, 2025. (REUTERS/Ammar Awad)

Still, Ofran is realistic about the current political climate. “Our government is totally crazy; they don’t care about the lives of the Israelis, the hostages, the soldiers and so they don’t care about public opinion,” she said.

“Under these circumstances, it’s very hard,” she added, though she remains hopeful that international recognition of Palestine — now by more than 150 countries — could shape Israeli debate. “It’s a simple right of Palestinians,” she said.

Polling suggests nearly half of Israelis support a US-backed framework that includes recognizing a Palestinian state in exchange for normalization with Arab countries.

“Nearly half of the Israeli public supports a regional-political-security framework that includes an agreement to establish a Palestinian state,” Ron Gerlitz, director of the aChord Center at Hebrew University, said in a January statement.

Palestinian Bedouin children play football, as the communities of Jabal Al-Baba face displacement due to plans to build a new Israeli settlement near the E1 road, in Jabal Al-Baba in the Israeli-occupied West Bank, on September 17, 2025. (REUTERS/Ammar Awad)
Israeli right wing activists take part in a rally organized by settlers groups to promote Israel's resettling in Gaza, on the Israeli side of the Israel-Gaza border, near the border,  July 30, 2025. REUTERS/Ronen Zvulun)

For families like Salem’s, however, the debate over statehood feels distant as they brace for another round of demolitions.

More than 65,000 Palestinians have been killed and 168,000 injured since the war in Gaza began last October, according to Palestinian health officials. Against that backdrop, Jabal Al-Baba’s plight has struggled to attract sustained global attention.

Still, the community clings to hope that international pressure could halt the E1 project. Ofran believes the tide could yet turn. “Israelis will kick this government out,” she said. And if the next leadership recognizes the E1 plan as a “horrible mistake,” she added, “they will block it.”

Until then, Jabal Al-Baba’s residents live under the shadow of demolition orders, determined to hold on to their hillside homes — a stand not just for survival, but for identity, continuity, and the future of Palestine itself.
 

 


Argentina’s Milei suffers veto overrides again, a blow before consequential midterms

Argentina’s Milei suffers veto overrides again, a blow before consequential midterms
Updated 03 October 2025

Argentina’s Milei suffers veto overrides again, a blow before consequential midterms

Argentina’s Milei suffers veto overrides again, a blow before consequential midterms

BUENOS AIRES: Argentine lawmakers on Thursday overturned two vetoes by President Javier Milei, marking a setback for the libertarian leader ahead of key legislative elections that could shape the future of his economic reform agenda.
The opposition-controlled Senate voted overwhelmingly to override Milei’s vetoes of bills boosting funding for public universities and pediatric health care, with margins of 59-7 and 58-7, respectively.
Milei, who has implemented deep austerity policies to reduce the size of government, said the new spending would jeopardize Argentina’s fiscal balance.
In September, Argentina’s congress for the first time overturned a veto issued by Milei, reinstating a bill that increased spending for people with disabilities.
The latest pushback comes at a precarious time for Milei, as the country prepares for midterm elections on October 26 and his popularity drops, in the face of a corruption scandal and public weariness with his austerity measures.


Morocco’s youth-led protests demand better schools and hospitals, prime minister resignation

Morocco’s youth-led protests demand better schools and hospitals, prime minister resignation
Updated 03 October 2025

Morocco’s youth-led protests demand better schools and hospitals, prime minister resignation

Morocco’s youth-led protests demand better schools and hospitals, prime minister resignation
  • Resignation demand came after police killed 3 people on Wednesday as largely peaceful protests turned into riots in Leqliaa, a small town outside the coastal city of Agadir
  • Protesters asked King Mohammed VI to intervene and some urged Prime Minister Aziz Akhannouch to step down and give way to a more competent administrator

RABAT, Morocco: Youth-led demonstrators in Morocco took to the streets on Thursday for a sixth straight night despite fears of more violence after police killed three people the night before.
The protesters in at least a dozen cities, including Casablanca, demanded better schools and hospitals, with some calling for Prime Minister Aziz Akhannouch to resign.
The call for resignation came after police killed three people on Wednesday as largely peaceful protests turned into riots, with banks looted and cars set ablaze.
Though Morocco’s king is the country’s highest authority, protests in Morocco routinely focus on the government charged with carrying out his agenda. On Thursday, hundreds chanted for King Mohammed VI to intervene against the government. Crowds shouted “The people want to topple Akhannouch” and “Government out!” as demonstrations unfolded peacefully.
In his first public remarks, Akhannouch said earlier on Thursday that he was mourning Wednesday’s deaths. He praised law enforcement for its efforts to maintain order and indicated that the government was prepared to respond favorably to the protesters, without detailing reforms under discussion.
“The approach based on dialogue is the only way to deal with the various problems faced by our country,” Akhannouch said.
Escalating tensions
The pledge for new efforts to address the protests came a day after authorities said armed rioters had stormed public buildings and the youth-led anti-government demonstrations showed few signs of abating.
Security forces opened fire at demonstrators on Wednesday, killing three people in Leqliaa, a small town outside the coastal city of Agadir. Morocco’s Interior Ministry said the three were shot and killed during an attempt to seize police weapons, though no witnesses could corroborate the report.
The ministry said 354 people — mostly law enforcement — had sustained injuries. It said hundreds of cars were damaged, as well as banks, shops and public buildings in 23 of the country’s provinces. Throughout the country, roughly 70 percent of the demonstrators were minors, according to ministry estimates.
The demonstrations, organized by a leaderless movement known as Gen Z 212 dominated by Internet-savvy youth, have taken the country by surprise and emerged as some of Morocco’s biggest in years. By midweek, they appeared to be spreading to new locations despite a lack of permits from authorities.
Frustrations simmer
Those taking part in the so-called Gen Z protests decry what they see as widespread corruption at everyday people’s expense. Through chants and posters, they have contrasted the flow of billions in investment toward preparation for the 2030 World Cup, while many schools and hospitals lack funds and remain in a dire state.
“Health care first, we don’t want the World Cup,” has emerged as among the week’s most popular refrains on the street.
Pointing to new stadiums under construction or renovation across the country, protesters have chanted, “Stadiums are here, but where are the hospitals?”

People protest against corruption and calling for healthcare and education reform, in Rabat, Morocco, on Oct. 2, 2025. (AP Photo/Mosa'ab Elshamy)

The recent deaths of eight women in public hospital in Agadir have become a rallying cry against the decline of Morocco’s health system.
As Morocco prepares to host soccer’s Africa Cup of Nations later this year and politicians gear up for a parliamentary election in 2026, the link has drawn attention to how deep disparities endure in the North African kingdom. Despite rapid development, according to some metrics, many Moroccans feel disillusioned by its unevenness, with regional inequities, the state of public services and lack of opportunity fueling discontent.
“The right to health, education and a dignified life is not an empty slogan but a serious demand,” Gen Z 212 said in a statement.
Officials have denied prioritizing World Cup spending over public infrastructure, saying health sector problems were inherited from previous governments.
Clashes and arrests
Chants were fewer as violence broke out in several cities on Wednesday evening, following days of mass arrests in more than a dozen cities, particularly in places where jobs are scarce and social services lacking.
The Moroccan Association for Human Rights has said that more than 1,000 people have been apprehended, including many whose arrests were shown on video by local media and some who were detained by plainclothes officers during live television interviews.
The chaos came despite warnings from authorities, political parties in government and the opposition and the organizers themselves. In a statement published on Discord, the Gen Z 212 protest movement earlier on Wednesday implored protesters to remain peaceful and blasted “repressive security approaches.”
Still, the protests have escalated and become more destructive, particularly in cities far from where development efforts have been concentrated in Morocco. Local outlets and footage filmed by witnesses show protesters hurling rocks and setting vehicles ablaze in cities and towns in the country’s east and south.
The “Gen Z” protests mirror similar unrest sweeping countries like Nepal, Kenya and Madagascar.
 


How ֱ guards intellectual property online

How ֱ guards intellectual property online
Updated 03 October 2025

How ֱ guards intellectual property online

How ֱ guards intellectual property online
  • Saudi Authority for Intellectual Property plays a leading role in preventing such cybercrimes 
  • Saudi laws such as the Personal Data Protection Law and the Anti-Cybercrime Law directly safeguard personal identity

RIYADH: As modern technology continues to advance, artificial intelligence is becoming central to everyday life, reshaping how people interact with information and identity. 

From sourcing data and generating images to powering live-streamed avatars like VTubers, AI is transforming creativity and entertainment. Yet, these innovations also bring risks — particularly the growing threat of digital identity theft. Without proper safeguards, creative ideas and personal likenesses can be copied, misused, or stolen.

A creator’s perspective

Saudi content creator and VTuber PikaLoli knows these challenges firsthand. She explained the importance of protecting her digital persona.

“Since my character and brand exist only online, it’s really important for me to prevent others from copying or misusing my content,” she said.

Shutterstock illustration image

Working as a VTuber, she added, is a demanding role that blends multiple disciplines. “I produce gaming videos, roleplays, and short storytelling on YouTube, blending technology and creativity to bring magical digital experiences to life. Although I appear as an animated character, every part of my content is carefully crafted and fully run by me.”

Since launching her channel in April 2021, PikaLoli has gained more than 1 million subscribers and built an online community she plans to expand further. But the work, she stressed, is more than a hobby: It’s a full-time job that involves voice acting, editing, directing, and staying creative nonstop.”

Despite embracing digital platforms, she remains cautious about AI. “As much as I love how AI can help with animation and content ideas, I don’t fully trust it to represent my identity. It’s my voice, my energy. AI can’t replace the real Pikaloli. I see AI more like a tool or assistant, not a creator.”

Opinion

This section contains relevant reference points, placed in (Opinion field)

To protect her work, she relies not on watermarks, but on the uniqueness of her character and the loyalty of her fans. “Even if someone tries, I trust my community to recognize and support the original.”

She also uses secure platforms, monitors for content misuse, and stays closely connected with her community. As she put it, “a strong community helps protect you from impersonators too.”

A global challenge

Concerns about identity theft extend far beyond individual creators. Globally, millions fall victim to digital fraud each year. In France alone, more than 200,000 people are affected annually. Offenders can face penalties of up to one year in prison and a fine of 15,000 euros ($16,300), according to the IN Group website.

The website describes identity theft as a crime in which someone assumes the identity of another person — or uses their information without consent — in ways that can cause harm to reputation, finances, or security.

ֱ’s regulatory framework

In ֱ, the Saudi Authority for Intellectual Property plays a leading role in preventing such crimes.

“SAIP aims to regulate, support, develop, nurture, protect, enforce, and enhance IP in ֱ in line with global best practices. It reports directly to his royal highness, prime minister,” said Fahad Alzamil, executive director of corporate communication and spokesman for SAIP.

SAIP illustration photo

He explained that both citizens and residents can register copyrights, trademarks, and patents online.

“All citizens and residents within ֱ can apply for intellectual property registration through the official website of the Saudi Authority for Intellectual Property. The process requires accurately completing all required fields in the application.”

With AI making it easier than ever to create manipulated images or videos, Alzamil stressed that regulations are in place to protect people from such risks. He cited Article 17 of the Copyright Law, which “prohibits the publication, display, or distribution of a photograph without the permission of the person depicted, covering both traditional and AI-generated pictures or audiovisual works.”

DID YOU KNOW?

• In France, more than 200,000 people fall victim to identity theft every year, leading the government to introduce strict regulations to combat the issue.

• Article 17 of ֱ’s Copyright Law prohibits the publication, display, or distribution of a photograph without the permission of the person depicted — a rule that applies to both traditional and AI-generated images and audiovisual works.

• The Saudi Authority for Intellectual Property’s Beneficiary Support Center offers comprehensive assistance, including in-person consultations, complaint handling, and follow-up services.

In addition, Saudi laws such as the Personal Data Protection Law and the Anti-Cybercrime Law directly safeguard personal identity.

To strengthen enforcement, SAIP combines advanced monitoring tools with awareness campaigns. According to Alzamil, the authority also works with international bodies like the World Intellectual Property Organization to ensure alignment with global best practices.

Balancing innovation and security

AI offers vast opportunities for innovation but also raises pressing concerns about identity protection. For creators like PikaLoli, maintaining authenticity requires vigilance, while for regulators like SAIP, it means building strong legal and digital safeguards.

As Alzamil emphasized, protecting digital identity is not only a matter of law but also of awareness and collaboration. The future of creativity, he suggested, depends on trust, responsibility, and collective efforts to secure both identity and intellectual property in the digital age.

 


Manchester synagogue attacker is a UK citizen of Syrian origin: police

Manchester synagogue attacker is a UK citizen of Syrian origin: police
Updated 02 October 2025

Manchester synagogue attacker is a UK citizen of Syrian origin: police

Manchester synagogue attacker is a UK citizen of Syrian origin: police
  • Police arrested three other suspects in the attack

LONDON: British police said Thursday the man who attacked people outside a Manchester synagogue before being shot dead by officers was a UK citizen of Syrian origin, with three other suspects detained.
“We can confirm that three suspects are currently in custody and have been arrested on suspicion of commission, preparation and instigation of acts of terrorism. They are two men in their 30s and a woman in her 60s,” Greater Manchester police said.

Two people were killed on Thursday and four wounded when a man ploughed a car into a crowd outside a packed Manchester synagogue on a sombre Jewish holiday and then embarked on a stabbing spree, UK police said.

Police said they shot dead the suspect and arrested two other people within hours of the attack, which occurred as Jewish communities around the world marked Yom Kippur, the holiest holiday in the Jewish calendar.