An appeal for information has been issued after it emerged that two teenagers were attacked by a gang in the Waterside area.
Up to 15 unknown youths attacked two 15 year-old boys on Thursday, May 5, although details of the attack only emerged yesterday.
The unprovoked incident took place in the Knockwellan Park area shortly after 9pm.
The boys were walking close to the Bowling Green when they were attacked but managed to escape with cuts and bruising to their face, head and arms.
Police have appealed for anyone who witnessed the incident or who has any information to call them 0845 600 8000 or to pass on information anonymously by calling Crimestoppers on 0800 555 111.