Video circulating on social media shows chaotic scenes as an attacker kneels on top of another man, stabbing him several times in the head.
Bystanders, one of whom is wielding a hurling stick, then intervene and wrestle the attacker to the ground.
One of the bystanders can be heard telling police officers “he's trying to cut his head off.”

The injured man, aged in his 40s, was taken to hospital with significant injuries to his face, neck and back. He remains in a serious condition.
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A man in his 30s, who police said they believe to be Sudanese, was arrested in connection with the incident and remains in custody.
There is still a significant police presence in the area, with cordons in place and markers visible on the ground.
PSNI Assistant Chief Constable Ryan Henderson said "a critical incident" has been declared, with an investigation underway to establish a motive.
Mr Henderson said: "This brutal attack will have sent shockwaves through the community, causing real concern.
"I want to reassure the local community that we are treating this attack with the utmost seriousness. Our investigation is continuing at pace."
He added that police were on the scene within minutes and said the members of the public who intervened showed "bravery and community spirit".
Mr Henderson also asked the public not to share footage of the attack.

Prime Minister Sir Keir Starmer has called the incident "sickening", adding that there will be "absolutely no tolerance for abhorrent scenes of violence like this on our streets".
Sir Keir said: "The horrific attack in Belfast last night is sickening. My thoughts are first and foremost with the victim, and I thank the first responders, including members of the public who intervened."
North Belfast MP John Finucane said: “I am shocked following a horrific attack in north Belfast last night.
“My thoughts are with the individual who has been taken to hospital following serious injuries, and I hope they make a full recovery.
“I have spoken with police today and would urge anyone with information about this appalling attack to come forward and assist the investigation.”
Justice minister Naomi Long praised the "brave people who disarmed the attacker", and asked people not to share the “very graphic images” of the attack, calling them “deeply disturbing and traumatising to view."
Leader of the Democratic Unionist Party (DUP) Gavin Robinson called the attack “barbaric”, and said no one who has seen the video "will be unable to unsee it", while Ron McDowell, deputy leader of the Traditional Unionist Voice (TUV) called it “one of the most horrific pieces of footage I have ever witnessed”.
Ulster Unionist Party (UUP) leader Jon Burrows said the incident was "beyond any attack I've seen in the likes of Northern Ireland before".
Police have urged anyone who witnessed the incident, or has dashcam or CCTV footage, to contact police at Tennent Street on the non-emergency number 101, quoting reference number 1654 08/06/26.



