A man was punched while walking Bristol's Queen Square causing him to fall and fracture his skull.
The victim was rushed to hospital where he was treated for his injuries - he was later discharged and is now recovering at home.
Police are urging any witnesses of the assault to come forward with information. The offender is said to be a white man aged between 25 and 35 years old, approximately 5ft 10ins tall, with short, dark hair and stubble.