A 33-year-old man has been arrested after a man was taken to hospital with stab wounds.
Officers were called to Tottenham Street in Great Yarmouth just after 0200 BST on Saturday morning to deal with an altercation.
Officers found an injured 19-year-old man, who was taken to the James Paget Hospital. His wounds have been described as serious.
The suspect, from Great Yarmouth was being interviewed by police.
Anyone with information about the incident is asked to contact police.