The PSNI says it has made 23 arrests in connection with disorder that follows a knife attack in Belfast on Monday. The attack leaves a man with significant injuries, prompting unrest in the city afterward. Multiple reports describe ongoing police activity as the number of arrests reaches 23. In parallel, thousands of people attend an anti-racism demonstration in Belfast, reflecting community engagement in response to the events. The reports do not indicate that the demonstrations are linked to the arrests, but they present them as part of the broader public reaction in Northern Ireland and Belfast. Police continue to address the aftermath of the incident, including investigation-related arrests related to the disorder. The coverage also situates the events within a wider context of public concern and demonstrations against racism in the city. No additional details are provided in the supplied summaries about charges, the suspect’s identity, or specific locations of the disorder. The information is presented as reported by the PSNI and local reporting.