Two teenage boys were robbed and one was assaulted in Macnaghten Road, near the Station pub, at around 9.20pm on Tuesday (April 17).
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The boys were approached by two male suspects “on BMX or racing bikes”.
Both the boys were grabbed and one was assaulted, sustaining minor injuries.
A green Adidas bag containing school books, a bank card and a small amount of loose change were taken.
One suspect is described as being white, about 5ft 6ins tall, small build with blonde hair wearing a tracksuit and with his face covered. He had a black and silver bike.
The other is also white, about 18 years old, medium build, again with blonde hair and wearing a blue tracksuit.
Police say a passing motorist assisted the victims, and they would like that person to come forward to assist with their enquiries.
If you have information you can contact the police by phoning 101 quoting reference 44180141707, or call Crimestoppers anonymously on 0800 555 111.