Police were called at 2.47pm on Thursday, 10 June to Cedars Road, SW4 to reports of a stabbing.
Officers and LAS attended where a man was found with multiple stab wounds. He has been taken to a London hospital by LAS and an update awaits on his condition.
Two men fled the scene by car and shortly after collided with another vehicle where they decamped on foot.
Road closures are in place on Cedars Road and the surrounding area.
There have been no arrests at this early stage.
Enquiries continue and police remain on scene.