Several people have died and dozens were injured after a tram derailed and overturned in Croydon.
Five people were left trapped inside the tram after it came off its tracks in a tunnel near Sandilands tram station at about 6AM.
Three of those people are freed, but at the time of writing it is believed that two people remain trapped.
Ambulances took 51 people to St George's Hospital in Tooting, and Croydon University Hospital, some of whom are seriously injured.
The cause of the crash is unclear, but the overturned tram remains on its side next to an underpass and seems to have derailed where the track branches.
Robin Smith, assistant chief constable of British Transport Police, said: "A number of people have been taken to hospital with injuries, and sadly it looks as though there has been some loss of life."