Police are searching for three men who attacked a train passenger and stole £19,000 of cash from him.
A 31-year-old man, of East Ham, had changed the money into euros at a bureau de change in Victoria Station at around 12.10pm on July 25.
He got on a Victoria line tube to north London and was attacked by the men who took his bag containing the cash when he got to Kings Cross.
Detective Constable Steve Ajayi, said: “The victim and another man chased the three men from Kings Cross station into a nearby hotel.
“The three attackers threatened a member of the public before fleeing with the money.
“I have released images of four men I want to talk to, as I believe they have important information regarding this incident.
“If anyone recognises them, please contact British Transport Police.”
Anyone with information should call 0800 405040, or text 61016, quoting reference B4/TSUB of 1/8/2014. Alternatively call Crimestoppers anonymously on 0800 555111.