Western Health is looking into the crash of a privately-owned ambulance that happened on the Trans-Canada Highway on Tuesday.
Reliable Ambulance Service was transferring a patient from St. John's to Corner Brook when the vehicle lost a wheel near Whitbourne.
The driver managed to keep the ambulance upright as it came to a stop in the centre median of the divided highway.
The patient, family members and two paramedics were injured in the accident.
The paramedics and family members were treated at the clinic in Whitbourne, while the patient had to be brought back to St. John's in another ambulance for treatment of more serious injuries.
Western Health said the emergency vehicle is regularly inspected and maintained, and had been inspected two weeks ago.
The ambulance was towed to Corner Brook for further inspection, to figure out what went wrong.