A second young child involved in a crash on Desert Rd in the Central Plateau on Friday has been pronounced dead.
The accident, which involved two cars and two truck-trailer units, happened just before 3:30pm between Waipakihi Rd and Rangipo Intake Rd.
The death brings the Easter road toll to four.
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Senior Sergeant Fane Troy said after one child died at the scene, the second passed away in Starship Hospital as a result of their injuries. Both children were correctly restrained in car seats, police say.
Another person remains in critical condition in Waikato Hospital.
In a statement, police urged motorists to watch their following distances as they made their way home as the Easter break comes to a close.
Police won't release the age and gender of the deceased until family have been contacted - many are overseas, so they say it could take some time.
Both the serious crash unit and the commercial vehicle safety team are investigating.