Police in Northern Ireland arrest two men following a serious altercation in north Belfast. According to reports, the incident takes place in the Crumlin Road area in the early hours of Friday. Police say a knife was involved in the incident. Officers arrest two men in connection with the altercation and investigate the circumstances surrounding the incident. The reports describe the event as a “serious altercation,” but do not provide further details about injuries, the exact sequence of events, or any additional suspects. The police statement referenced in coverage emphasizes the use of a knife and that arrests have been made as part of the ongoing investigation. Authorities continue to examine evidence and may conduct further inquiries to establish what led up to the incident and to confirm the full extent of any injuries. No further information is reported in the provided excerpts about charges, court proceedings, or the victims involved.