British Transport Police said a Facebook post from last week which said that a tram "lifted onto one side at 40 mph" near the same location as the crash "will now form one of our lines of inquiry".
The Rail Accident Investigation Branch (RAIB) has launched a witness appeal. Anyone who was on the tram or has information relevant to the accident is asked to complete an incident report form on the RAIB's website. An interim report into what happened will be published by the RAIB next week, with a final report, including any safety recommendations, coming at the conclusion of the investigation.
Rail Accident Investigation Branch officials have confirmed they will publish an interim report on the Croydon tram crash next week.
British Transport Police have confirmed that six men and one woman died in yesterday's tram derailment in Croydon.
Following the incident in Croydon yesterday, we can confirm that six men and one woman have sadly died.
We are working with the Coroner to identify these seven people and their families are being supported by specially trained officers.
We remain at the scene, where investigations and forensic work continue.
A picture released from the government investigation shows the scale of damage caused to the derailed Croydon tram.
Flowers and tributes for victims have been placed near the police cordon around the site of the Croydon tram crash.
Aerial video footage shows the scale of the devastation of the Croydon tram crash.
Forensics teams are combing the crash site for clues to what caused the derailment which killed seven passengers.
A Crystal Palace fan described as a 'friendly, genuine lad' was among those killed when a Croydon tram derailed.Read the full story ›
The driver of a tram that derailed killing seven has been questioned amid suggestions it failed to break before taking a corner at speed.Read the full story ›
The driver of a tram which derailed in Croydon this morning killing 7 people and wounding at least 50 others is being held by police on suspicion of manslaughter.
British Transport Police confirmed they were questioning the 42 year old man, who is from Beckenham.
An investigation is underway into exactly what caused the crash - however investigators have stated the tram was travelling at a higher than normal speed when it crashed.
Seven passengers have been killed in the Croydon tram crash, British Transport Police have confirmed.