UK leaders urge calm in the wake of a stabbing in Belfast that triggers anti-immigrant protests across the UK. The incident involves a knife attack on a street in Belfast, where a Sudanese man in his 30s is arrested, charged, and remanded into custody. UK leaders respond by calling for restraint after the stabbing sparks overnight unrest and demonstrations, including calls from far-right figures and groups for additional anti-migrant protests. Multiple outlets report that the protests are linked to the identity and background of the suspect, described as an asylum-seeker, and that the victim is left in critical condition. Police also call for calm following the arrest. While the reporting focuses on public reaction and political messaging from far-right supporters, all sources describe the same core sequence: a Belfast stabbing leads to the arrest and charging of a Sudanese suspect, followed by immediate calls for further protests and local unrest, prompting government and law enforcement officials to emphasize peaceful conduct.