A man in his early 20s is fighting for life after being stabbed.
Officers were called to Beulah Crescent in Thornton Heath, south London, just before 2pm on Thursday after reports of a knife attack.
An air ambulance was scrambled but the victim was eventually taken to hospital by road after being treated at the scene. He is in a life-threatening condition.
A Metropolitan Police spokesman said he had been stabbed more than once but that the weapon had not yet been identified.
The attack comes in a week which has seen a spate of stabbings in the capital.
On Sunday, 16-year-old Ben Kinsella, brother of former EastEnders star Brooke Kinsella, was knifed to death in Islington.
Later the same day, the bodies of French students Laurent Bonomo and Gabriel Ferez, both 23, were found riddled with knife wounds after a flat fire in New Cross, south-east London.
Tunisian national Hamouda Bessaad was stabbed to death on Old Kent Road, south-east London, on Monday, while Dee Willis, 28, died after a knife attack in Peckham a day later.
Anyone with information should call police on 0208 667 1212.
