WorldA knife attack in Northern Ireland horrified onlookers on Monday night, sending a man to hospital in serious condition and raising tensions in the United Kingdom at a time when questions surrounding immigration and policing have been at the forefront of political discourse.Police in Belfast no indication at this stage of a terrorist attackChris Iorfida · CBC News · Posted: Jun 09, 2026 9:17 AM EDT | Last Updated: 40 minutes agoListen to this articleEstimated 6 minutesThe audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results.Police work at the scene of a stabbing in northern Belfast, Northern Ireland, on Tuesday. Police and politicians were appealing for calm in the wake of what has been described as a shocking attack. (Paul Faith/AFP/Getty Images)A knife attack in Northern Ireland horrified onlookers on Monday night, sending a man to hospital in serious condition and raising tensions in the United Kingdom as questions about immigration, policing and online disinformation have been at the forefront of political discourse.The attack occurred in north Belfast, with a man in his 40s in hospital with what police described as "significant injuries" to his eyes, face and back. Democratic Unionist Party Leader Gavin Robinson described the attack as "medieval" in nature."This is a deeply concerning assault and I have declared this a critical incident. We have commenced an investigation to establish a motive," Ryan Henderson, assistant chief constable of the Police Service of Northern Ireland, said in a statement. At a subsequent news conference, Henderson said that those who had rushed to the scene to intervene "undoubtedly" saved a life.There is no indication that the suspect had accomplices and a terrorist attack is being ruled out at this stage, Henderson said. A kitchen knife was recovered, he said, and the suspect is believed to have lived near the scene of the crime. Henderson said there would be a heightened police presence in the coming days for public safety and he urged any protests that proceed take place peacefully.British Prime Minister Keir Starmer called the attack "sickening" in a statement."I have absolutely no tolerance for abhorrent scenes of violence like this on our streets," he said.First Minister Michelle O'Neill of Sinn Féin and leaders from across Northern Ireland's political spectrum released a joint statement on Tuesday condemning the attack, expressing condolences to the victim and their family, and calling for calm."It is essential that the facts are established through proper investigation and due process," the leaders said.Farage posts image of attack The leaders followed the call of Henderson and the police, urging those on social media not to share or repost what has been described as graphic videos or images related to the incident."No good will come of sharing it or of turning on each other in this society, including for the clout of online voices who don't know or care about us and who offer absolutely nothing for the future," Claire Hanna, leader of the Social Democratic and Labour Party, said separately.The leaders' statement came after Reform UK Leader Nigel Farage had already done so, reposting an image of a person with their arm raised and kneeling on a street, with blocks over the faces of two persons in the image.AnalysisHow Britain’s far right hijacked the murder of Henry NowakPolice said the suspect, believed to be in his 30s, faces a charge of attempted murder.After initially identifying the suspect as Somalian, the Northern Ireland police service said he was of Sudanese descent. Henderson said it was his understanding that the suspect was "given leave to remain" in Northern Ireland — raising the prospect they were in the country on a temporary or permanent basis — but that he expected the British Home Office to provide more details. The North West Migrants Forum, a non-profit charity that helps integrate newcomers in Northern Ireland, said in a statement that it was "horrified" by the incident, while praising bystanders who rushed to help the victim or helped apprehend the attacker.The organization appealed for calm, with a reference to the decades-long deadly violence between Catholics and Protestants that largely ended with negotiated agreements in 1998."The overwhelming majority of people who come through our door desire only to live in peace and to build a life for themselves and their families," it said. "Northern Ireland knows well the danger of blaming an entire community for the deeds of an individual or small faction."Heightened tensionsThe attack came ahead of a scheduled speech by British Opposition Leader Kemi Badenoch, where she discussed equalities laws and policing.The Tory leader called on police to "bring the facts out as quickly as possible so that we can get some clarity" in the Belfast incident.Badenoch in her speech said she believed that the fear of appearing racist had hampered police action and investigations in other incidents, including in the case of homicide victim Henry Nowak, the killings of three young girls in Southport by a young man with a history of concerning behaviour and years-long reports of sexual abuse by grooming gangs targeting minors.WATCH | British government pushes back on Vance comments:U.K. government responds after JD Vance’s remarks on Henry Nowak and immigrationJune 6|Duration 3:03Downing Street issued a statement pushing back after U.S. Vice-President JD Vance linked the death of 18-year-old Henry Nowak to immigration and what he characterized as civilizational decline in Europe.The issue of race and policing has come to the fore in recent weeks as more circumstances surrounding the police response to the deadly incident involving the 18-year-old Nowak in December came to light.Hampshire Police handcuffed Nowak as he lay dying from stab wounds after another man on the scene falsely alleged Nowak had committed a racist attack.The killer, a British-born Sikh man, was sentenced last week to life in prison, and several people were arrested in a subsequent night of protest that was encouraged by Farage and far-right leader Tommy Robinson.The Nowak killing aftermath also led to another diplomatic squabble between Britain and the U.S. The State Department, in a social media post about the Nowak killing, said "ideological conditioning and two-tiered policing are glaring symptoms of civilizational decline."U.S. Vice-President JD Vance on social media argued that Nowak would be alive "if the last few generations of European elites had stood their ground against the politics of self-hatred and the mass invasion of migrants, many of whom despise the West and the people who love it."Vance's comments overlooked the fact that Nowak was a duel citizen of England and Poland, with at least one grandparent born in the eastern European country. They also earned a rebuke from Starmer's office as well as Secretary of State David Lammy, who said he spoke to the vice-president — with whom he has developed a cordial relationship — after the remarks.The British government has stressed that Nowak's family has urged people not to exploit their son's death for political purposes.With files from Anna Cunningham of CBC News and Reuters