Three men and two women were assaulted by a gang of four men shortly after 11.15 pm on Saturday 31 May on French Lane in St Helier. One of the gang was wearing a white tee shirt and is described as stocky.
One of the men was arrested shortly afterwards but has since been released pending further enquiries.
Anyone with information about the assault or who saw either group in the lead up to the attack is asked to contact States of Jersey Police on 612612 or Crimestoppers anonymously on 0800 555111.