A second man has been arrested after two suspected graffiti artists were killed by a London Underground train in east London.
The train was entering the sidings for the night
British Transport Police (BTP) said two men, aged 19 and 21, were hit by a District Line train at the Barking depot at 2306 GMT on Friday.
Police said a group was seen spraying graffiti nearby just before the crash.
A 25-year-old man will be questioned along with a 23-year-old being held on suspicion of criminal damage.
A spokesman for London Ambulance Service said the two deceased hit by the train suffered multiple injuries and were pronounced dead at the scene.
Ch Supt Paul Crowther said a security guard had spotted a group spraying graffiti just before the crash.
He said: "It appears that they ran into the path of the train having emerged from a nearby depot. The train driver did try to stop but was unable to do so."
He said the men were not being chased by security personnel.
"Our enquiries so far have indicated that the security guards were some comfortable distance away from them and the group of people that ran away."
Ch Supt Crowther said the deaths were a reminder that spraying graffiti near railway lines was a "dangerous pastime".
A local resident, John Leitch said: "The train moved off and I could see that there were two bodies on the track. They looked like young men."
The bodies were moved from the tracks early on Saturday morning.
Police plan to look at CCTV footage as part of their investigation.