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
A dull and damp start but it will become drier and brighter from the north this afternoon but stay cold and windy.
A damp and cold night ahead. Valentine's Day will start cloudy but become brighter in the afternoon. Risk of showers along the Kent coast.
Cold and damp tonight with outbreaks of rain. A cold and dull start to Valentine's Day but becoming drier and brighter by the afternoon.