A man is fighting for his life after being stabbed in south London on Friday night.
The 35-year-old was reportedly attacked in Balham near Clapham Park at around 7.35pm.
Metropolitan Police officers and paramedics were at the scene and the man was given first aid before being rushed to hospital.
He remains in a critical condition.
Witnesses at the scene reportedly chased the attacker away from the victim before police arrived.
No arrests have yet been made and police have asked anyone with information to come forward.
Detective Superintendent Gareth Gilbert said: “This was a shocking and brutal attack, carried out in broad daylight on a residential street. Our officers are working quickly to identify and arrest the attacker and it is imperative that anyone with information should come forward immediately.
“We recognise this incident will be deeply disturbing to the local community and want to reassure residents that they can expect to see an increased number of officers in the area over the coming days.
“We would also like to pay tribute to the members of the public who bravely chased the suspect away from the scene while he was still armed.”
Anyone with information or footage is urged to contact police on 101, quoting CAD 6708/18Jul. Anonymous reports can be made to Crimestoppers on 0800 555 111.