Police are looking for three people who they believe targeted six teenagers in separate attacks.
All the attacks happened in the Milton Road area of Oundle between 5.30pm and 7pm on January 12.
Two 16-year-olds were shoulder barged and spat at by the three people as they walked through Chapel Lawns. One was also racially abused.
The same three attackers then approached a 14 and 16-year-old, punching one to the ground and racially abusing him. The other was told to lie on the floor, and the attackers then started kicking both teenagers.
A 16-year-old who disturbed the assault was chased and ran away.
After failing to reach him, the attackers then demanded another 16-year-old hand over his bag, before assaulting him.
The teenagers who were attacked suffered minor injuries.
Police believe the same three people were repsonsible for all the attacks.
Call 101 if you saw anything that day.