Police are appealing for witnesses after a man allegedly pulled a knife during an argument with three or four other men.
The fight started by the Fish Market on Minden Place at around 10:15pm on Thursday night, and continued onto Cattle Street and Beresford Street.
It comes after a separate fight in the same area two days earlier.
Police say the lone man was followed by the group from the Fish Market towards the junction with Cattle Street, when he allegedly pointed a knife towards them.
The man believed to have been in possession of the knife is described as thin, around 6’0” tall, wearing black clothing and a baseball cap.
One man was arrested at the scene and a knife recovered. No one was injured during the incident.
Officers say a number of cars drove through the area of St Helier at the time of the incident. They are looking to hear from anyone who saw what happened or may have dashcam footage from the time.
Anyone with information can call 01534 612612 or Crimestoppers anonymously.

Menacing or misleading election posts could result in police action, islanders warned
Automated medication dispensers to be rolled out in Jersey
Fishermen's inquests conclude as marine safety investigation is made public
Jersey International Motoring Festival gets into gear
J999 goes under the hammer
Regent Gymnastics Club opens new home with Olympic Equipment
Survey asks where people in Jersey go sea fishing
Recent heatwave 'good and bad' for Jersey Royals