Two bodies have been found on the train tracks between Hackney Wick and Stratford in London.
Both people died from serious injuries consistent with electrocution in two seemingly separate incidents, British Transport Police said.
Officers were called to the London Overground line shortly after 1am following reports of a casualty on the tracks.
Over an hour later at 2.31am, a second casualty was found on the same line, in close proximity to Stratford.
Earlier this morning the line was closed between Stratford and Dalston Kingsland while police carried out the investigation, a spokesperson said.
Minor delays are also reported between Stratford and Richmond or Clapham Junction.
Police are appealing for anyone with information about the deaths to come forward.
Det Chf Insp of the BTS Tim Tubbs said: An investigation is now under way to discover what happened and how these two people came to lose their lives on the railway.
At this time we are treating their deaths as unexplained as we make a number of urgent inquiries.
I would ask anyone who was near Stratford or Hackney Wick last night, and saw something which they think might be relevant to contact us as soon as possible.