This shocking footage was captured by a passer-by as a fight broke out in Huddersfield town centre.
The trouble flared in Cross Church Street shortly before 7pm on Saturday when the town centre would have been busy after the Town football match.
A man can be seen running into the road and kicking another man who then stumbles to the ground.
But despite a number of people witnessing the distressing scenes the attack, no-one reported it to police and the victim has not been traced.
It was however picked up by CCTV operators monitoring the town centre and police attended.
Although when they arrived on the scene there was no sign of those involved.
See still images from the video below.
A West Yorkshire Police spokesman said: “Officers were deployed to Cross Church Street, Huddersfield, shortly before 7.15pm on Saturday, 15 August, after being notified by CCTV operators of an altercation involving a number of individuals.
“On attendance all parties allegedly involved had left the area. Enquiries were made at the scene but no victims were identified or offences reported.”