The victim was found in Albany Road near Burgess Hill at around 6.40pm. 

Officers erected a cordon and at least two ambulances attended. 

Reports on social media sais an air ambulance had landed nearby. 

A spokesperson for the Metropolitan Police said: ” Police were called at approximately 18:40hrs on Tuesday, 26 May to reports of a male found suffering a stab wound in Albany Road, SE5.

“Officers, London Ambulance Service and London’s Air Ambulance all attended the scene. The male – believed aged in his mid-teens – was taken to hospital for treatment; condition awaits.

“No arrests; enquiries into the circumstances are ongoing.

“A crime scene remains in place at the location.

“Anyone with information that could assist police is asked to call 101 or tweet @MetCC and quote CAD 7135/26May. Alternatively, contact the independent charity Crimestoppers on 0800 555 111.”

Passersby took to Twitter to share pictures of officers guarding the cordon.

One photo appears to show a person being wheeled into the back of an ambulance on a stretcher.

One man said: “Does anyone know why the Air Ambulance is trying to land on Burgess Park?”

Another said: “Loads of cops around. Sectioned off part of Burgess. Might be a stabbing.”

This is a breaking news story… more to follow.