"Our AT team was heartbroken to hear the news this morning. Our thoughts are with the person's family at this awful time."
The driver of the bus involved will be stood down and provided with wellbeing support while police, the bus operator and AT's safety team investigated the circumstances of the incident, van der Putten said.
The local transport authority was currently engaging with the Pukekohe community on safety improvements for the busy area near the train station and bus interchange.
"This crash is a painful reminder of the importance of projects like this which are designed to keep Aucklanders safe no matter how they're travelling."
Earlier today, a retailer said "about 20" police officers as well as St John staff and firefighters responded to the incident.