A 16-year-old boy has been scarred for life after he was attacked in Kelvingrove Park.
The victim was set upon by a boy on a black BMX bike who was with a large group of teenagers.
The violent confrontation happened just hours of a large-scale disturbance in the park.
Police have mounted a large presence over the holiday weekend to stamp out illegal drinking.
The teenager and a 16 year-old girl were within the park near to the entrance to Kelvin Way at around 8pm when they were approached by a large group of teenagers.
One of the group started a fight with the pair in which the 16 year-old boy sustaining numerous facial injuries.
The 16 year-old boy was treated at the Queen Elizabeth University Hospital.
The teenager on the bike is described as around 15 years of age, around 5ft 5 of slim build with short, shaved blonde hair.
He was wearing shorts and t-shirt and was riding a black BMX bike.
Police also want to identify the other members of the group who were with him.
Detective Constable Stephen Palmer said: “This attack has left a teenager with a serious injury which will leave him permanently scarred.
"Violence will not be tolerated in our communities and it is vital that we find the person responsible for this.
“At this time we do not know exactly why this altercation took place and we are appealing for anyone who knows anything about it to get in touch with police.
“There is a playpark near to where this incident took place which people would have been using at the time. Somebody must have seen something.
“Do you remember seeing a teenager on a black BMX with a group of others in Kelvingrove Park last night?”
Anyone with any information is asked to contact Police via 101, quoting incident number 4634 of Friday 19 April.