A masked knifeman stabbed a teenager in broad daylight before a driver who witnessed the attack tried to use his car in an attempt to stop him fleeing.
Police are hunting for the attacker who was caught on CCTV chasing his victim on a busy road before the petrified teen trips and falls on a zebra crossing.
The attacker lunges at the teen four times with the blade and appears to stab him in the stomach.
After the victim kicks out to defend himself the knifeman strolls off past the shocked woman and child who witnesses the attack yards away from them.
The attack took place in Gravesend in Kent, on Tuesday at around midday.
A brave driver who witnessed the attack as they waited at the crossing mounted the pavement towards the knifeman to try and stop him fleeing the scene.
The horrifying footage shows the black vehicle swerving towards the attacker who launches himself over the front of the car.
The clip also shows the victim staggering across the road after he hid in a nearby newsagent until his attacker to left the scene.
Paramedics and police were called to the scene.
The teenager was rushed to a hospital in London for urgent treatment.
A spokesman for Kent Police said: “Police were called at 12.47pm on Tuesday to a report a teenage boy had been assaulted by another person in Milton Road.
“Officers attended alongside South East Coast Ambulance Service and Kent Surrey Sussex Air Ambulance.
“The boy has since been taken to a London hospital for treatment to an injury which is consistent with a stab wound.
“Enquiries are ongoing and anyone with information, including mobile phone footage or privately held CCTV that captures the incident, is asked to call Kent Police on 01474 366149 quoting 15-0672.
“You can also contact the independent charity Crimestoppers anonymously by calling 0800 555111.”