A victim of the Croydon tram crash which left seven people dead left more than 50 injured has been named as 19-year-old Dane Chinnery.
The crash, just after 06:00 GMT on Wednesday, saw the tram derail and overturn as it negotiated a sharp bend in the track.
The driver of the tram, a 42-year-old man from Beckenham, has been arrested on suspicion of manslaughter.
Meanwhile, tributes have poured in for Mr Chinnery on social media.
One described the Crystal Palace fan as “an amazing happy outgoing person who will always be remembered”.
Another read: “Hearts been broken today. Dane is the funniest boy I’ve ever met in my life. If anyone ever needed anything he’d be there doing all he can to help.”
British Transport Police (BTP), who have yet to officially confirm the identities victims, are investigating claims the tram was exceeding permitted speeds and that the driver may have fallen asleep are being investigated.
The Rail Accident Investigation Branch (RAIB) said the tram, which had been travelling from New Addington to Wimbledon derailed as it was negotiating a “sharp, left-hand curve” which has a speed limit of 12mph.
The RAIB said it had been travelling at a “significantly higher speed” than is allowed.
Police expect the crash site to remain sealed off until at least Thursday evening as forensics teams examine the scene.
A BTP investigator said “a number of factors”, including whether the driver had fallen asleep or blacked out at the wheel, were being examined as possible causes.
London Ambulance Service said a total of 51 injured casualties taken to two hospitals, with eight having serious or life-threatening injuries.
London Mayor Sadiq Khan, who visited the crash site on Wednesday, warned the number of dead may increase.