A man was punched and fell to the ground outside St John's Village cafe.
The alleged assault happened at around 12:25pm on Friday (10 November)
Police say the assailant shouted at the victim before hitting him.
The victim - a man in his forties - suffered facial injuries but did not need medical treatment.
The suspect is described as white, stocky and in his early thirties. He had short blond/brown hair and was wearing dark trousers and left the scene in a white van.
Both men were wearing orange high-visibility jackets.
Any witnesses are asked to call police on 612 612, or contact CrimeStoppers anonymously on 0800. 555 111.

Could harnessing the youth vote change the election?
Inclusive island-wide fundraising challenge asks for 'moment of understanding'
Jersey ranks second in list of short-break destinations
HMS Tyne visits for Jersey Boat Show
Penalty shootout ends Jersey Bulls' promotion hopes
Asian Hornet Queens and nests double 2025 numbers
Jersey Monopoly still without an Old Kent Road
11 health professionals join Health and Care Partnership Board