Police have now issued a second 'E-fit' image following an assault in Riverside Park earlier in the month that left a 12-year-old with serious injuries.
The boy was playing football with friends when it's thought another boy assaulted him at around 8pm on April 7. The victim was taken to hopsital for surgery with a broken jaw.
Police say the new image has been produced after they worked closely with a young witness.
The teenage boy police are trying to trace is described as white, about 15-years-old, with glasses and a "European accent".