This footage shows the aftermath of a moped attack near Harrods.
The Metropolitan Police is trying to trace the suspects after a 47-year old man had liquid thrown in his face.
The force was called to Walton Place near Harrods at 8.33pm on Monday July 31 after reports of men on a moped attacked a pedestrian.
The victim was treated for minor injures after London Ambulance Service took him to hospital.
In the headcam video bystanders can be seen rushing to the victim's aid with bottled water, apparently in fear that he had been attacked with acid.
Having witnessed the attack a passing black cab driver also offered to take the man to A&E, shouting: "I'll take you to the hospital, get in! Get him in!!"
A Rolls-Royce can be seen gliding past as the pair of attackers, wearing dark clothing and black helmets, mount the pavement to make their escape.
The footage, apparently recovered from a passing motorcyclist, gives a compelling first-person view of the tense aftermath of the kind of attacks that have seen a worrying rise in recent months.
Figures from 39 forces in England and Wales showed a spike in the number of attacks involving corrosive substances, with more than 400 carried out in the six months up to April 2017.
It is unknown whether the liquid was a corrosive substance.
The police, who are yet to make an arrest, believe the liquid was thrown during an attempted robbery in Walton Street at the junction with Pont Street.
The footage, which captured the suspects after the incident, shows them dressed in dark clothing, wearing helmets, leaving the scene in the direction of Draycott Avenue.
Enquiries are ongoing to establish the full circumstances of the incident.
Any witnesses, anyone with any information or in possession of footage of the incident should contact police via 101, or via Twitter @MetCC.
To give information anonymously call Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.
Keep up to date with the latest news from around the county via the free Get West London app.
You can set up your app to see all the latest news and events from your area, plus receive push notifications for breaking news.