Detectives are urging anyone who may have seen a stabbing in a park to come forward.
An 18-year-old was taken to hospital after he attacked in St George’s Field, near Carterhatch Lane, Enfield at around 5pm on Monday, July 4.
He has since been discharged from hospital.
The Metropolitan Police says it had been called to reports of a fight.
Detective Constable Wayne Freeman said: “St Georges Field would have been busy with people at that time of evening and I would ask anyone who witnessed this incident and who could assist this investigation to come forward.
“I am also keen to hear from anyone who may have taken photos or video of the incident – you may have captured something that could help us greatly.”
A 21-year-old man and a 20-year-old woman were arrested on suspicion of GBH in connection with the incident.
Both have been bailed pending further enquiries to a date in early October.
Anyone with information is asked to contact police on 101 or tweet @MetCC and quote CAD5349/4Jul.
Information can be given anonymously to Crimestoppers on 0800 555 111.
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