Officers were called to Old Market Lane about 10pm on Sunday 18 September following a report of two males being stabbed at that location.
A group of four people are believed to have been involved.
A 16-year-old boy and an 18-year-old man sustained injuries during the attack. Both were treated in hospital for their injuries.
Witnesses, or anyone with information about the incident, are urged to report it online or call 101, quoting serial 1355 of 18/09.
You can also contact the independent charity Crimestoppers anonymously on 0800 555 111 or report it online.
