A man stabbed in Denmark Hill was attacked during an AirBnB party, say investigating officers.
The Met is working under the assumption that the 26-year-old, who remains in hospital, was knifed during a group fight.
He was taken to hospital by car in a critical condition but has since stabilised and he is no longer considered to be at risk of losing his life.
Detective constable Rob Neville, said: “We believe the victim was at a party in an address that had been rented out via AirBnB when he was attacked.
“He is incredibly lucky; for for the speed at which he was taken to hospital this could well have been a murder investigation.
“I need to hear from anyone who was at the party and witnessed an altercation, or who saw people leaving in haste.
“This was a violent incident that nearly cost a man his life and it is imperative that we find those responsible.”
Three men were arrested on suspicion of GBH with intent – one aged 24, and two 23-year-olds. All have now been bailed.
Any witnesses should call police on 101 or Crimestoppers – to stay completely anonymous – on 0800 555 111.