Detectives investigating three reports of pellets being fired at moving vehicles on the M20 have arrested five people.
The attacks happened one evening last month on the London-bound section of the M20 at the junction with the M26.
At least one motorist was hurt.
A 17 year old woman, an 18 year-old man and a 19 year-old man, all from West Malling, had already been arrested on suspicion of criminal damage with intent to endanger life.
This morning a 15 year-old boy and a 20 year-old man, both from West Malling, were arrested and are currently in custody.
More top news
Friday's lunch time weather for the west of the region
Friday's pollen count with Amanda Houston
Friday's lunch time weather for the east of the region