A 23-year-old man could lose his eye after being shot with an airgun while he waited for a taxi outside a hotel, police have said.
The man had left the Fullarton Park Hotel in Tollcross Road, Glasgow, with his girlfriend and some other friends at about 0030 GMT.
As they waited for a taxi, words were exchanged with another group.
A man in that group then shot at the victim with what is thought to have been a BB gun.
The injured man was taken by ambulance to Glasgow Royal Infirmary and was later transferred to Gartnavel Hospital for eye surgery.
Det Con Nicola Kilbane, of Strathclyde Police, said: "We have been unable to speak to the victim due to his serious condition, however we do know he had been drinking with his girlfriend and a few of her friends in the Fullarton Park Hotel until pub closing time."
She said the suspect was believed to have been with two girls and possibly another man and they were also in the hotel before closing.
Det Con Kilbane added: "As they all stood outside an argument appears to have taken place and the suspect, without provocation, simply shot at the victim. No disturbance took place at any time.
"The victim is in a very serious condition in hospital and it is probable that he will lose his eye.
"This is thankfully a highly unusual crime to take place in this area, however this should not take away the horrific nature of what has happened, and the victim and his family are devastated.
"We are all too aware of the tragic consequences using an air weapon can have, and the person responsible must be traced."
The suspect was described as being in his early to mid 20s, of very slim build with short dark hair, longer on top, and was wearing jeans and a yellow zipper jacket.
One of the women in the group was in her early 20s, of stocky build and had blonde shoulder-length hair. She was wearing a black and white top.
The other woman was aged 19-20, of slim build and had bright red/dark hair in a bob.
It is thought the group got into a small white car after the incident which drove in the direction of Amulree Street. Police said this was possibly being driven by the man who was previously in their company.
Det Con Kilbane asked anyone who was in the hotel on Friday night, or anyone who saw the shooting or recognises the descriptions, to contact police.