A baby injured at her Invercargill home was so badly hurt that a police officer had to drive the ambulance to hospital to free up ambulance staff.
The three-week-old girl is still in a critical condition in Starship Children's Hospital in Auckland.
Fifteen police officers are working on a criminal investigation, including interviewing the infant's parents, who were at the address at the time of the incident.
St John Ambulance says a police officer drove the baby to hospital so that the two paramedics on hand could both take care of her.
The organisation says that situation occurs occasionally when a patient needs significant care from the ambulance crew.
