A man has been arrested on suspicion of attempted murder following what police described as a brutal knife attack in north Belfast that left a man in serious condition in hospital.
The incident occurred at about 22:30 BST on Monday in the Kinnaird Avenue area, prompting the Police Service of Northern Ireland (PSNI) to declare a critical incident and launch an investigation into the motive behind the assault.
Police said the suspect, believed to be Sudanese and in his 30s, remains in custody.
The victim, a man in his 40s, suffered significant injuries to his face, neck and back and remains hospitalized in a serious condition.
Authorities also urged the public not to share graphic footage of the attack circulating online.
Assistant Chief Constable Ryan Henderson said officers arrived at the scene within minutes and are treating the case with the utmost seriousness.
He said the attack had sent "shockwaves through the community" and reassured residents that investigators were working at pace to establish the circumstances and motive.
Police initially identified the suspect as Somali before later confirming he was Sudanese, describing the correction as part of a fast-moving investigation.
Video shared online appeared to show members of the public confronting the attacker before police arrived, including one individual carrying a hurling stick.
Henderson praised those who intervened, describing their actions as an example of bravery and community spirit.
Police also said there was no indication at this stage that the attack had a terrorist motive.
The attack triggered widespread condemnation from political leaders across Northern Ireland and the United Kingdom.
Prime Minister Keir Starmer described the incident as "sickening" and said he had "absolutely no tolerance for abhorrent scenes of violence like this on our streets."
Northern Ireland Secretary Hilary Benn called the attack deeply shocking and thanked members of the public who came to the victim's aid.
A joint statement signed by leaders of Northern Ireland's five main political parties condemned the violence and urged people not to share disturbing images or videos of the assault.
Political figures including Justice Minister Naomi Long, First Minister Michelle O'Neill and Deputy First Minister Emma Little-Pengelly also appealed for calm while police continue their investigation.
Authorities are understood to have held emergency discussions amid concerns about potential unrest following online calls for demonstrations.