The incident unfolded in Red Lion Street, near the bus stop opposite the former Debenhams building, at about 3pm on Friday (September 25).
The man, who was wearing a fedora and had several chains around his neck, was put into cuffs before falling to his knees.
It is not yet clear what the man was arrested on suspicion of. (Image: Newsquest)
He was then pinned to the pavement by officers and began screaming and shouting as concerned shoppers and people waiting for the bus looked on.
At least two police cars and a van attended the scene.
It is not yet clear what he was arrested on suspicion of, but Norfolk Constabulary has been contacted for comment.