Seven people have died and dozens more have been injured after a tram overturned in London, police have said.
People were trapped inside and more than 50 were taken to hospital after the derailment in Croydon just after 06:00 GMT.
The tram driver, 42 from Beckenham, has been arrested on suspicion of manslaughter.
British Transport Police said they were investigating whether he fell asleep.
The Rail Accident Investigation Branch (RAIB) said the tram was travelling at a “significantly higher speed than is permitted”.
The police have set up a number – 0800 0560154 – for friends and family to call for information.
Deputy Chief Constable Adrian Hanstock said: “After liaison with the coroner, we can confirm that at least seven people have lost their lives as a result of this incident.
“Our officers will continue to work tirelessly throughout the evening to formally identify them and provide care and support for their families.”
Live updates on Croydon tram crash
London Ambulance Service said eight people have serious or life-threatening injuries, while a total of 51 had been taken to two hospitals.
Robin Smith, Assistant Chief Constable of the British Transport Police, said they were investigating whether the driver fell asleep, alongside “a number of factors”.
The RAIB said the Wimbledon-bound tram derailed as it was negotiating a “sharp, left-hand curve” which has a speed limit of 12 mph.
Trams are not fitted with any safety protection systems that apply the brakes automatically if they are going too fast, according to the Office of Rail and Road.
The overturned tram remains on its side next to an underpass and appears to have derailed where the track branches.
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