A 19-year-old man is critically ill after he was attacked in Liverpool city centre in the early hours.
Police believe the man had been with a friend when they were approached by three men near the Mood Bar on Fleet Street, where a fight broke out.
He was taken to hospital with suspected knife wounds just after 0300 BST, where he is said to be seriously ill.
Detectives are looking at CCTV from the area and are trying to trace the men thought to be involved.
The first is white, about 18 to 21 years old, 5ft 8in (1.7m) and slim.
He is said to have an unusual walk and is pale with short ginger hair. He was wearing a light blue polo shirt.
The second man is described as being the same age and white, slim, with short brown hair and was wearing a grey polo shirt.
The third man is white, about 20 years old and slim with short brown hair and was wearing alight green polo shirt.
Anyone with information is being urged to contact police.
Det Insp Eddie Cowan said: "A young man has been left in a very serious condition following this incident, and I'm sure the public would agree that this level of violence in unacceptable on our streets.
"Please help us find the people who are responsible for this attack, any information, no matter how small could assist with our investigation."