Three men have died after being struck by a train near a south London station.
It is understood that spray cans were found near the bodies of the men, who are believed to be in their 20s.
Police were called to Loughborough Junction station, near Brixton, at about 07:30 BST and the three were pronounced dead at the scene.
The deaths are being treated as “unexplained” and police are investigating how the men came to be on the tracks.
Supt Matt Allingham, from British Transport Police (BTP), said their injuries are “consistent with having being hit by a train”.
It is believed they died “earlier in the morning” before the bodies were spotted by another train driver who contacted police, he added.
Police officers remain at the scene where they are working to identify the men and inform their families.
It is believed the victims could have been struck overnight, when freight trains use the rail network more frequently as the passenger pathways are clear.
Supt Allingham said police were “aware that there are a number of speculative comments about this on social media”
He added: “It is too early for us to comment on their reasons for being on the track.”
Police were unable to confirm whether the men were hit by a freight or passenger service.
Supt Allingham said officers “have delivered the sad news to one family”, and are working to identify and locate the next of kin for the other two men.
Det Supt Gary Richardson said his “thoughts are with the family and friends of these three people”.
“My team are now working hard to understand what happened and how these three people came to lose their life on the railway,” he added.
He asked anyone who was near the station on Monday morning or “saw something which they think might be relevant” to contact police.
The station remains open, but BTP warned that train services will be delayed while inquiries are carried out.
Network Rail said it was “assisting the British Transport Police as they investigate an incident at Loughborough Junction this morning”.
London Ambulance Service said it was called to the station just before 09:00.
“We sent a number of ambulance crews but sadly three people were found dead at the scene,” a spokesperson added.
Rail regulator the Office of Rail and Road has opened a preliminary investigation.
Loughborough Junction is an elevated station managed by Thameslink and located on a line between Herne Hill and Elephant and Castle stations.
It is near three other lines used by trains which do not stop at the station.