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 believed the stabbing happened during a fight between two groups of men and added they were treating the death as murder.
Keylin Tejeda, 32, from Elephant and Castle, said one of the victims was a regular customer at her pattie shop El Monte.
“I was coming from a restaurant with my partner and when we were passing by we saw him lying down.
“I could see who he was, I saw him. The ambulance were operating on him on the floor,” she said.
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 on to the street.”
London Mayor Sadiq Khan called the death “a senseless loss of a young life” and urged witnesses to contact police or Crimestoppers.
The death bring the number of homicides in the capital to a total of 92 so far this year.
The son of a disabled artist who posed for a famous Trafalgar Square sculpture while pregnant with him has died aged 19.
Parys Lapper died suddenly last week, his family said.
His mother Alison Lapper, who was born with shortened legs and no arms, posed nude for the artwork mounted on the square’s fourth plinth in 2005.
Her fiance has appealed to bikers to escort Parys on his final journey to Worthing Crematorium on Thursday.
On Facebook Si Clift said Parys was a “mischievous, generous, kind, loving, frustrating, cheeky, forgiving, beautiful boy”.
He was “his own man” and “a good son”, Mr Clift said.
Mr Clift said he and Ms Lapper had been “blown away” by people’s kindness, humbled by their kind sentiments, and overwhelmed by messages of support.
He added: “Please take away from this a realisation that you are not alone, that you can talk and not to hold things within.
“Whatever it is, there is help.”
Ms Lapper “would absolutely love to see as many noisy motorbikes as possible to escort Parys on his final journey”, he said.
They will accompany him from her home in Shoreham-by-Sea, West Sussex.
The family is also holding an open house on Tuesday evening for his friends to decorate, paint, stick messages or sign their names on his empty coffin.
Ms Lapper co-hosted the 2016 BBC Four show No Body’s Perfect with fashion photographer Rankin, exploring how digital photography, social media and selfie culture had affected people’s sense of identity.
Parys also made appearances on screen as one of the stars on the BBC series Child Of Our Time, which tracks millennial babies from their infancy into their young adult lives.