Detectives are trying to trace a young man allegedly attacked in Caernarfon town centre last weekend.
Another man has been arrested after four people were assaulted in Turf Square at around 3am on Sunday morning (19th May).
Sergeant Steve Williams at Caernarfon police station said they want the alleged victim to come forward and help with their inquiries.
He added: ”We believe he may have been injured and would like to know that he is safe and has received the appropriate care.”
Anyone who may know the man or have any information about the assaults should contact Caernarfon police station on 101, quoting reference no. X068451, or Crimestoppers anonymously on 0800 555 111.