london ambulance service
The 26-year-old 's baby was delivered at the scene and is in critical condition.
A man, believed to be aged in his 20s, died at the scene.
No arrests have been made and inquiries are continuing.
A 29-year-old man died while a second man remains in hospital.
A teenager and a woman in her 60s were both taken to hospital.
Police were called at about 5.50pm on Sunday where they found a woman injured.
Four people were attacked from behind in an apparent knifing spree.
The victim, aged in her 40s, had sustained a stab wound to her back after being attacked by a man.
No arrests have been made.
He remains in a serious condition.