A Deliveroo rider was stabbed in broad daylight in north London on Saturday afternoon.
A large crowd rushed to help the injured man, thought to be in his late twenties, by providing emergency first aid after the stabbing on Fore Street, Edmonton, at around 4.30pm.
The victim was rushed to hospital, where his condition is currently unknown.
Footage of the incident shared on social media appeared to show members of the public detaining a man nearby.
A Met spokesperson said a 19-year-old man was arrested on suspicion of causing grievous bodily harm.
He was taken to a north London hospital for treatment with non life-threatening injuries. Officers did not say how he was believed to have sustained his injury.
A crime scene remains in place, and the road is closed between the A406 and Colyton Way.
A Met spokesperson told the Standard: “Officers arrived and found a large crowd who were providing first aid to the man, who is believed to be aged in his late 20s.
“He has been taken to a north London hospital; we await an update on his condition.
“A 19-year-old man was detained nearby and subsequently arrested on suspicion of causing grievous bodily harm.
“He was taken to a north London hospital for treatment; his injury is not believed to be life-threatening.”