A man has died and another is in hospital following a stabbing at a Tube station.
Police were called to Elephant and Castle station at about 23:30 BST on Sunday and found two men with stab wounds in a street nearby.
A 24-year-old man died on Monday and a 25-year-old is in a serious condition.
British Transport Police said it was “a shocking act of violence” and two men had been arrested on suspicion of violent disorder.
Officers said they were treating the man’s death as murder.
Det Ch Insp Sam Blackburn said: “This was a shocking act of violence and we are working tirelessly to identify and trace those responsible.
“While the investigation is still at an early stage, at this time we believe there was an altercation between two groups of men inside the Underground station and it is here the victims sustained their injuries before making their way onto the street.”