Police have said there has been "some loss of life" after a tram derailed this morning.
Scores of emergency services are at the scene in Croydon where two carriages overturned at about 6.10am on Wednesday.
Images from the scene show the vehicle on its side next to an underpass near the Sandilands tram stop.
The tram appeared to have derailed at a point at which the track branches.
People living nearby told of hearing a loud noise and seeing the injured being carried off on stretchers.
London Ambulance Service said: "We have treated a number of patients and over 50 have been taken to hospital."
London Fire Brigade sent eight fire engines and more than 70 firefighters to the scene at Addiscombe Road.
Station manager Joe Kenny said: "Firefighters have released a number of people and two people remain trapped.
"All the emergency services are working closely together to help those involved in this incident."
Croydon resident Hannah Collier, 23, said: "I heard a massive crash at about 6.15am, then heard shouting, then the emergency services arrived.
"They started bringing up the casualties, some very seriously injured. People were carried away on stretchers."
Adil Salahi, whose property overlooks the track, said the noise he heard was "sudden".
The 76-year-old said: "It was about 6.10 or 6.15 and because I was praying I could not move and try to check what it is. I thought it was something in the garage doors. Then I thought it was some lorry."
A Transport for London (TfL) spokesman said: "We are currently working with the emergency services following a derailment involving a tram in Croydon.
"There is currently no service on the tram between Reeves Corner and Addington Village / Harrington Road. We will give further information as soon as possible."
Images by Steve Parsons/PA Wire
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