The victim was between 80 and 90 years old and died on the spot. Police are calling on people who were in the area during the incident in west London. The incident may have been captured with a dashcam in a car or a camera on a helmet.
The police speak of a terrible incident that will cause great concern. Mayor Sadiq Khan said he was dismayed by the knife attack. People are regularly stabbed to death in London, but the dead are predominantly young men or young people.