Neither company had discussed the risks posed by the chemicals.
A one-day-old baby died after receiving critical injuries in the attack.
The death has been referred to the Coroner.
Eight vehicles were shot in a series of attacks.
Emergency services were called to the site just north of Hamilton on Thursday morning.
Emergency services rushed to the airport.
The cuttings will be replanted for weavers across the Waikato to access.
There have been no reports of injuries.
Paula Southgate needed to be escorted to her car after an angry mob turned up at her office.