Police are appealing for information about an incident near Morrisons supermarket in Wellingborough in which two girls were assaulted by three boys.
The incident took place some time between 4pm and 5.20pm on Sunday, October 7, in the park area between the supermarket and Monks Way.
All the boys are thought to be aged about 10 and were all wearing t-shirts and tracksuit bottoms.
One of the boys was riding a black bicycle.
Witnesses to this incident, or anyone with information about it, can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.