A man has died after being stabbed at a train station.
Wood Street station is expected to be shut all day
The victim, thought to be in his 50s, had got off the last train at Wood Street station in Walthamstow, east London.
Police are unsure where he was attacked but said he had staggered to some stairs and fell down them at just after midnight on Monday.
He was taken to hospital where he later died. Police said the station was likely to remain closed until Tuesday.
The death is being treated as murder.
Police said the victim was white and was wearing a grey jacket, grey trousers and white shirt.
Officers believe he may have given the name 'John' to the ambulance crew that was called by passengers at the station.
Detective Chief Inspector Ron Scott said: "We are appealing to anyone who may be missing a loved one to contact us.
"It appears that the victim had been heading home and someone must be anxious for his whereabouts. It is essential that we identify him as soon as possible. "
A post-mortem examination showed the cause of death was loss of blood resulting from a stab wound to the stomach.