Wairarapa police have linked a National Crate Day radio promotion to a weekend spike in arrests throughout the region for disorderly behaviour and domestic violence.
Masterton police sergeant Simon Irving said Wairarapa police had arrested 18 people over a 24-hour period from 7am on Saturday and "the majority of those had said they were involved in various ways with National Crate Day".
He said a group of young and mainly male National Crate Day drinkers were involved in smashing the rear window of a police car in Herbert St in the town about lunchtime on Saturday.
The culprit could not be identified, he said, but several hours later three members of the group, aged from 19 to 21, were arrested at Queen Elizabeth Park for disorderly behaviour and breaching a town liquor ban.
He said infringement notices were handed out for the liquor ban breaches and a pre-charge warning was given for the single count of disorderly behaviour.