This is the moment a man clinged on to the back of a bus while holding a large knife.
The unusual clip shows the man hanging onto the back of the moving red vehicle while wielding the large weapon in Brighton, east Sussex.
The man, shown wearing a blue hooded top and trousers and white shoes, is then seen peering over the rear window of the bus to apparently look at passengers.
Onlookers are seen watching the surfer as the double decker bus passes shops and traffic on a busy street in the city.
The incident was on a Number 79 service operated by Brighton and Hove Buses towards Bitchling Beacon.
A video has gone viral of a man clinging to the back of a bus while wielding a large knife
The man is shown holding onto the bus on a busy street in Brighton, east Sussex
At one point in the clip the man is seen appearing to peer through the rear window of the bus at the passengers
Sussex Police have appealed for information about the footage in order to identify the man in the video.
In a statement, a spokesperson for Sussex Police said: ‘We are urging anyone who witnessed this incident, has video evidence, or recognizes the person in question to come forward immediately.
‘We are aware of a video circulating on social media which appears to show a person holding onto the back of a moving bus in Brighton, in possession of a knife.’
Previously a teenager was seen hanging on the back of a red double decker London bus on Lansbury Drive, Hayes.
The boy is seen gripping onto the Number 90 bus travelling at 30mph before falling to the ground on his feet.