Liardet St in central New Plymouth, where a fight broke out overnight, leaving two injured after being struck by a car.
A woman is critically injured and a second person suffered moderate injuries after they were run over by a vehicle in New Plymouth overnight.
Police said a section of Liardet St remains closed this morning while officers conduct a scene examination.
A 38-year-old woman has been arrested following the incident that took place at 2.40am.
A police spokesperson said initial inquiries showed a 23-year-old woman was struck by the vehicle following a fight on Liardet St involving several people.
The woman struck by the vehicle was left critically injured.
She was taken to hospital and was now in a stable condition, said the spokesperson.
A friend of the victim, a 22-year-old man, also suffered moderate injuries, after his foot was run over.
Police had spoken to a number of witnesses but were keen to hear from anyone who saw the incident unfold and had not yet spoken to them.
Investigations continue into the cause of the crash.