A teenage boy was kicked unconscious in Swindon on Friday night.
The 15-year-old suffered severe injuries after the assault in Cavendish Square, close to the bus station.
He was with friends at about 2300 BST when the group was approached by two men.
The younger of the men punched the teenager in the face, causing him to fall to the ground, where he was kicked in the head before passing out.
The man who threw the punch is described as white, with light hair.
He was accompanied by an older man, also white, with black hair and a long face.
He was wearing a black leather jacket and blue jeans, aged in his 30s / early 40s and about 5 ft 7 ins tall.
Police are appealing for witnesses.