Officers rushed to Elmgrove Road at the junction with Station Road, Harrow, on Saturday evening after reports of a stabbing.
The 27-year-old victim was found with stab wounds at 7.05pm and treated at the scene before being taken to hospital. He remains in a critical but stable condition.
Detectives are urging anyone who was in the area, especially road users with dashcam footage, to come forward to assist with the investigation. No arrests have been made so far.
To help the police, members of the public can call 101 or tweet @MetCC with reference CAD 5900/25Feb. Information can also be provided anonymously to Crimestoppers on 0800 555 111.
A crime scene remains in place as officers continue their enquiries.
Originally published by UKNIP.
