A teenager was beaten up in in Cotmanhay what police are calling an unprovoked assault.
The 17-year-old was walking in Bridge Street last Wednesday at about 3,30pm when a man shouted at him.
He turned and was hit on the back of the head.
Both men then punched him while he was on the floor until he was able to get up and run away.
One was described as being about 6ft 2ins, wearing a red Adidas hoody.
The other was wearing a grey and blue tracksuit.
Call police on 101 with information.