A ute may have been driven dangerously on a Northland beach before the horrific crash which claimed the lives of three Brethren church members, police say.
The crash in Northland on Monday brought the Queen's Birthday weekend road toll to 11 - the highest in 27 years.
Susie Stewart, 48, her daughter Sadie, 16, and family friend Jamie Wearmouth, 18, died when a ute hit a tree on Baylys Coast Rd near Dargaville about 6.40pm.
Mrs Stewart and the two teenagers were members of the Plymouth Brethren church, previously known as the Exclusive Brethren.
The group had been travelling home from Baylys Beach when the crash happened.
Police are calling for witnesses as their serious crash investigation continue.