A 15-year-old girl was attacked as she pushed her baby son in a buggy.
Police said the girl was pushing her 14-month-old son in Market Street, Whitworth, when the incident happened between 5.30pm and 5.45pm on January 26.
The victim claimed she was followed by up to six girls aged around 16 or 17-years-old and then confronted by a further two girls as she turned into Market Street.
She alleged that the girls dragged her to the floor by her hair and assaulted her.
Officers said a motorist stopped and helped the girl, prompting her attackers to run off in the direction of the Half Way House.
Call police on 08451 25 35 45 or Crimestoppers on 0800 555 111.