The alleged incident occurred at 5.45 pm on Friday as the girl was on her way home from Haute Vallée School.She was walking down Mulcaster Street to catch a bus when one of five men behind her caught up with her.
She said he grabbed her wrist and spoke to her in a way that scared her.The girl broke free, shouted at the man, and ran to the Weighbridge.
He followed her and stood for some time at the Weighbridge.He is described as white, 5ft 9in tall, of medium build and aged between 20 and 30, with collar-length blonde hair, parted in the centre.
She recalled him having a foreign accent.
He was wearing a cotton shirt and smart blue jeans.
Anyone who recognises the man, or who witnessed the incident, should contact the police.