A witness saw five police cars, a St John critical care unit and two fire trucks at the scene.
St John was alerted at 1.25pm and sent two ambulances. Another patient was taken to hospital in a moderate condition.
The Serious Crash Unit was advised and an investigation into the circumstances of the crash was ongoing.
Meanwhile, emergency services were called to the scene of a serious crash between a motorcycle and a car also in Remuera.
Police attended at the intersection of Ladies Mile and Remuera Rd at 6.25pm yesterday.
A spokesperson said initial reports suggested there were serious injuries in that crash.
Road closures and diversions were put in place, and motorists were asked to avoid the area.
