A murder inquiry has been launched after a Croydon man's body was found on train tracks near Knockholt station following what police believe to have been a chase.

British Transport Police are investigating after the driver on Sunday's 11.40pm Sevenoaks to Charing Cross service reported seeing the body.

The death was not initially thought to be suspicious, but police have since launched a murder inquiry after "new information" came to light.

Detective Chief Inspector Paul Langley, who is leading the investigation, said: “Understandably this is an incredibly upsetting incident for this man’s family and we have specialist family liaison officers offering them support. Whilst formal identification is yet to take place, we believe this man to be a 24-year-old from Croydon.

“A post-mortem examination will take place in the coming days, from this we hope to understand exactly how this man died.

"In the meantime, we are trawling through all available CCTV and looking to speak with any witnesses or local residents who saw or heard anything."

Officers believe the victim was chased into Knockholt station by another man shortly before 9.30pm on Sunday, and was then chased onto the tracks.

A short while later, the other man walked back onto the platform and left the station.

DCI Langley said: "“Knockholt station is in a rural location and I know that very few people are likely to have been in the area at the time when both the victim and suspect went onto the tracks. However, if you were in the area at the time and saw a man chasing another, please contact us as a matter of urgency.”

Police have released CCTV images of a man they want to speak to in connection with the investigation. 

Anyone who recognises the man should text to 61016 or call 0800 40 50 40 quoting reference 3 of 06/11/2017.

Alternatively, call Crimestoppers on 0800 555 111.