An 18-year-old man was seriously assaulted in the early hours of Wednesday morning in Dundee.
The victim was walking with his two friends in Old Hawkhill near to the junction with Smalls Wynd at around 2.30am when they were approached by four men and the victim was thereafter assaulted.
The victim received treatment at hospital for a facial injury.
Police have now launched an investigation into the incident and are reviewing relevant CCTV footage.
They have also appealed to anyone who may have been in the area at the time and witnessed the assault.
Anyone with any information which may be useful should contact Tayside Division on 101 quoting CR/4667/17 or speak to any police officer.
Alternatively information can be passed anonymously via the charity Crimestoppers on 0800 555 111.
