A 16-year-old boy who was repeatedly stabbed in South Norwood was arrested for carrying a weapon upon his release from hospital.
The boy, who was stabbed in the face and back in Albert Road, remains in police custody.
Police were called to the road, at the junction with Portland Road, on Saturday, March 4.
On arrival no victim was found, but a 16-year-old took himself to hospital suffering multiple stab wounds.
His injuries were not thought to be life-threatening.
The group who attacked him made off in a vehicle, a Met spokesman said, and no arrests have been made.
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