A teenage girl was attacked by a pack of youngsters in Old Town as she was walking home.
The 15-year-old, and an 11-year-old were surrounded by the teenagers at the junction of Central Avenue and Royal Sussex Crescent.
They were jostled by the gang, who then punched and kicked the older girl before running off.
The attack took place at about 9.30pm on Thursday, October 2.
Anyone who saw what happened or who may have other information is asked to email firstname.lastname@example.org or phone 101, quoting serial 1619 of 2/10.
Alternatively they can call the independent charity Crimestoppers free and anonymously on 0800 555111.