Police had not released further details by mid-morning yesterday.
Meanwhile, a man was understood to have been flown to Hawke's Bay Hospital after being struck by a van as he ran across Herbert St, Waipukurau, about midday on Saturday.
The incident happened at the intersection of Herbert (SH2) and Russell Sts, where the Lowe Corporation Hawke's Bay Rescue Helicopter landed after flying from its base at the hospital in Hastings.
It has been a busy weekend for emergency services in the lower North Island.
An hour after the Puketapu crash, seven people were hurt - three badly - when their vehicle crashed on a notorious stretch of State Highway 3 in Manawatu.
Police said they were called to the single-vehicle crash on Rangitikei Line in Newbury at about 7.10pm.
A St John spokeswoman said three people were taken to Palmerston North Hospital with serious injuries and two with moderate injuries.
Two other patients had minor injuries and were treated at the scene.
Four ambulances and a manager vehicle attended the incident.